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Asian Finance & Banking Review
Vol. 1, No. 1; 2017

Published by Centre for Research on Islamic Banking & Finance and Business

The Impact of International Trade on Economic Growth in Nigeria: An Econometric Analysis 

     Stephen Egoro A. and Obah Daddy Obah 


The Impact of International Trade on Economic Growth in Nigeria: An Econometric Analysis 


Stephen Egoro A.1

Obah Daddy Obah1
1Department of Finance and Accountancy, Niger Delta University, Bayelsa State, Nigeria

Correspondence: Department of Finance and Accountancy, Niger Delta University, Bayelsa State, Email: obahdaddy@gmail.com

Received: October 14, 2017,        Accepted: October 19, 2017,     Online Published: October 26, 2017  

Abstract

The study examines the effect of international trade on the economic growth of Nigeria from 1981 to 2015. The model specified economic growth measured by gross domestic product as dependent on international trade proxy by non-oil imports, oil imports, Non-oil exports, and oil exports. Secondary data was adopted and sourced from CBN statistical bulletin. Multiple regression estimation techniques with the aid of E-view version 9 was used to analyze the effects of international trade on the economic growth of Nigeria. It was evidenced that international trade has a significant positive impact on economic growth in Nigeria. The study recommends that government should reduce over-dependence on oil exports and increase and diversify its export base to earn more revenue.


Keywords: International Trade, Economic Growth, GDP, Non-Oil import, Oil Import, Non-oil export, oil Export, Analysis.


1. Introduction

The economic growth of any economy is a crucial issue because of it, ultimately, forms the crux of economic development which is the desire of every economy (Todaro, 2010). The dividend of growth is what digests into the numerous strands of development indices that are enjoyed by the affected economy. It has, therefore, become the focus of every economy to harness every available resource towards enhancing sustainable growth. The external sector of the economy is one major aspect through which growth can be enhanced. This is so because of the economic interaction with other economies of the world, through trading, enhances the productivity of the economy. Thus, the need for international trade as it relates to global and domestic economic growth and development. International trade leads to specialization, increase in resource productivity, large total output, a creation of employment, generation of income and relaxation of foreign exchange restraints (Nnadozie, 2003). 


The positive relationship that exists between global trade and economic growth may be as a result of the likely positive externalities due to the involvement of different countries in the international trade. The role of international trade in promoting industrialization and economic development cannot be overemphasized. This is because foreign trade provides an impetus for industrial development by making inputs available for domestic production, particularly in developing economies including Nigeria where production activities heavily depend on imported inputs. Also, foreign trade enlarges market frontiers for domestic industrial output (exports), thus leading to increased investment, employment, output, and income. Foreign trade expands production possibility frontiers and broadens the consumption baskets of the people in the participating countries and thereby improves their welfare (Adewuyi & Adeoye, 2008).

International trade is simply known as the exchange of goods and services between nations of the world. At least two countries should be involved in the activities, that is, the aggregate of activities relating to trading between merchants across borders. Traders engage in economic activities for the purpose of the profit maximization engendered from differentials among international economic environment of nations (Adedeji, 2006). Kehinde, Jubril, Felix & Edun, (2012) asserts that trade can promote growth from the supply side, but if the balances of payment cost reduce the availability of imported inputs which enter the product of exports, thus forcing exporters to use expensive imports of double quality.

International trade allows for the exchange of goods and services cum foster healthy relations among countries irrespective of their level of economic development. A country involved in international trade need not have fear of hegemony or loss of its sovereignty because it is a mutual agreement to engage in trade across their border. A nation not participating in international trade is at risk of a slow pace of economic development due to the cogent fact that a country cannot be fully endowed with all the resources essential to be utilized for sustainable economic development.

The importance of international trade stems from the fact that no country can produce all goods and services which people require for their consumption largely owing to resources differences and constraints. As a result, this trade relationship suggests that economies need to export goods and services in order to generate revenue to finance imported goods and services which cannot be produced domestically.

International trade can be interchangeably referred to as ‘foreign trade’ or ‘global trade’. It encompasses the inflow (import) and outflow (export) of goods and services in a country. A country's imports and exports represent a significant share of her gross domestic product (GDP); thus, international trade is correlated to economic growth. In an open economy, development of foreign trade greatly impacts GDP growth (Li, Chen & San, 2010). Countries would be limited to goods and services produced within their territories without international trade. International trade is directly related to globalization because an increase in trade activities across the border is paramount to the globalization process. The globalized nature of an economy enhances its direct participation in the world market consequently leading to market expansion. According to Adam Smith, expansion of a country's market encourages productivity which inevitably leads to economic growth. 


Government earns revenue through international trade activities. International trade, as a major factor of openness, has made an increasingly significant impact on economic growth (Sun & Heshmati, 2010). The openness of a nation influences a country's growth rate by impacting upon the level of economic activities and facilitating the transfer of resources across borders. Nigeria is basically an open economy with international transactions constituting a significant proportion of her output (Emeka, Frederick & Peter, 2012). Nigeria's trade openness has increased the participation of foreigners in the economy by allowing the inflow of foreign capital and expertise, thereby impacting on her economic growth. However, the extent to which a country benefits from foreign trade is a function of a number of factors.  Among these factors is the trade policy regime operating in an economy. This could be protective or liberalized. Nigeria as a country has experimented with a mix of the two trade policy regimes.

At independence, Nigeria embarked upon import substitution industrialization (ISI) strategy as a means of promoting industrial transformation. The implementation of the ISI necessitated the imposition of a high rate of tariff and non-tariff barriers to trade (Oyejide, 1977; Adewuyi and Adeoye, 2008). Trade policy in the post-independence period was largely import licensing and haphazard application of tariff via the annual budget. This engendered a serious anti-export bias which seemed to hinder growth and development of the Nigerian economy (Oyejide, 2001). Since 1986 however, international trade policies have aimed at liberalization of the economy as well as achievement of greater openness and greater integration with the world economy. The policies thus ranged from abolition of marketing boards to introduction of the second tier foreign exchange market (SFEM), various export expansion incentive schemes, the establishment of the Nigeria Export-Import Bank etc. 


Liberalization of trade regime began with a partial dismantling of quantitative restrictions in 1986, which gave room for interim measures that led to a reduction of the number of items in the import prohibition list from 72 to 17 products categories (Adewuyi & Adeoye, 2008).


Thus, this implies selective import prohibitions and elimination of import licensing. Coupled with this was a tariff reform which was instituted via the Customs, Excise and Tariff Consolidation Decree 1988. This Decree featured a new classification based on the Harmonised System of Tariff classification (HS Chapters), which permitted direct international comparison of the country’s tariff lines and levels. It also featured a seven-year tariff regime so as to usher in stability and predictability. This reform was continued with Decree No.4 of 1995, which specified tariff for another seven-year tariff regime spanning1995 to 2001.

In a bid to expand her market access, Nigeria has signed bilateral, regional and trade preferential agreements with different countries. For instance, Nigeria is one of the founding members of Economic Community of West African States and of the World Trade Organization and a signatory to the Lome Convention (Ogunkola & Oyejide, 2001). Despite these efforts, trade in Nigeria has dwindled in the period of great liberalization. Similarly, alongside with trade liberalization is financial liberalization policies which were implemented to foster competition among the domestic firms and between the domestic import-competing firms and foreign firms with a view to promoting efficiency. Under trade liberalization policy, the levels of both tariff and non-tariff barriers were reduced and the commodity marketing boards were scrapped. Despite these policy measures, the performance of the economy in terms of growth has been dismal. Thus, it is in the light of this that the study intends to examine the impact of international trade on the economic growth of Nigeria.


Economic growth is one of the main objectives of every society in the world and international trade is fundamental to economic growth. International trade is considered as one of the very important contributors among them. Nevertheless, the overwhelming evidence of positive impact of international trade on economic growth cannot be overemphasized. However, there are some questions to ask: what relationship exists between Nigeria’s involvement in international trade and her economic growth? Moreso, the discovery of oil in commercial quantity in 1956 (Englama, Duke, Ogunleye & Ismail, 2010) in Oloibiri in the present day River State (Afaha and Aiyelabola, 2012), Nigeria has been an important player in the world affairs, economically and otherwise, particularly being the 12th largest producer of crude oil in the organization of Petroleum Exporting Countries (OPEC) (OPEC Annual Statistics, 2014). Unfortunately, these blessing by nature to Nigerian didn't reflect in the overall welfare of the citizen made worse (Soderborn and Teal, 2001), by the collapse of world oil market as a result of the glut in 1981 and 2015 (Muritala, et al, 2012; NBS, 2015). For example, crude oil price, which rose rapidly from $20.94 dollars per barrel in apart from oil, Nigeria export mainly primary products and often relies almost exclusively on a limited number of commodities, such exports are characterized by lower prices than manufactured goods plus highly volatile markets. Thus, Nigeria is often on the wrong end of unbalanced trade environment that favors developed countries. Nigeria with the abundant human and natural resources is paradoxically being regarded as one of the poorest countries in the world. Hence, the need to design appropriate strategy by diversifying the economy through export promotion, stimulating foreign direct investment and exchange rate stability in order to boost the productivity of Nigeria economy by raising the standard of living of the citizens (Kehinde, Akinde, Adekunjo & Femi, 2012). Moreso, the debate on the relationship between international trade and economic growth has exhibited considerable interest in the field of development economics; several empirical studies have been conducted to assess the role of international trade on economic growth of developed countries from various aspects (see, Kalaitzi (2013; Ruba Abu Shihab & Thikraiat Soufan, 2015; Kalaitzi, 2013; Kim & Lin, 2009; Abu al-Foul, 2006; Abou-State, 2005; Burridge & Sinclair, 2002; Seipati & Itumeleng, 2014). The findings of these studies indicate that international trades have a statistically significant positive impact on economic growth. However, for developing countries like Nigeria, the evidence is an inconsistency (see Awujola, 2013; Usman, 2011; Adeleye, Adeteye & Adewuyi, 2015; Oviemuno, 2003; Samuel & Chris, 2013). Therefore, there is the need to fill the literature gap.

2. Objectives of the Research
The general objective of the study is to examine the impact of international trade on economic growth in Nigeria. But specifically, the study will intend to;

i. To determine the impact of non-oil import trade on economic performance (GDP) in Nigeria.


ii. To determine the impact of oil import trade on economic performance (GDP) in Nigeria.

iii. To determine the impact of non-oil export trade on economic performance (GDP) in Nigeria. 


iv. To determine the impact of oil export trade on economic performance (GDP) in Nigeria. 

3. Research Questions

This research work shall be guided by the following research questions.

a) How and in what direction has non-oil import trade been affecting the economic performance of Nigeria as a proxy by Gross Domestic Product (GDP)?


b) How and in what direction has oil import trade been affecting the economic performance of Nigeria as a proxy by Gross Domestic Product (GDP)?


c) Is there any significant relationship between non-oil export trade and the economic performance of Nigeria as a proxy by Gross Domestic Product (GDP)?


d) Is there any significant relationship between oil export trade and the economic performance of Nigeria as a proxy by Gross Domestic Product (GDP)?


4. Statement of Hypotheses

For the purpose of this research work, three hypotheses are proposed:

a) H0: Non-oil import trade has not made any significant impact on the Economic growth as proxy by GDP in Nigeria


b) H0: Oil import trade has not made any significant impact on the Economic growth as proxy by GDP in Nigeria

c) H0: Non-oil export trade has not made any significant impact on the Economic growth as proxy by GDP in Nigeria


d) Oil export trade has not made any significant impact on the Economic growth as a proxy by GDP in Nigeria.


5. Significance of the Research
This study will be essential to policy maker to know more about the performance of international trade and economic growth. It will also assist in providing the frame work of where work has been done by earlier researchers. It will also provide a framework on which further research in international trade could be carried out. This study will also be an invaluable tool for students, researchers, research institutions and the general public that partake in international trade who wants to know more about the impact of international trade on economic growth of Nigeria. 
6. Scope of the Research
The scope of the study will span 34 years, that is, (1981 – 2014). The empirical analysis shall focus on the impact of international trade on the country’s economic growth. The gross domestic product (GDP) shall be used as the indicator for economic growth.

7. Literature Review

International trade is simply known as the exchange of goods and services between nations of the world. At least two countries should be involved in the activities, that is, the aggregate of activities relating to trading between merchants across borders. Traders engage in economic activities for the purpose of the profit maximization engendered from differentials among international economic environment of nations (Adedeji, 2006). Foreign or international trade concerns the study of the causes and consequences of the international exchange of goods and services, and of the international movement of factors of production. Foreign trade means an exchange of goods and services across international borders.  


The term international trade has been defined as trade across the frontiers; that is, with the rest of the world. It has been argued that it plays a prominent role in promoting economic growth and productivity in particular, and these debates have been ongoing since several decades ago. Furthermore, it has been revealed that internationally active countries tend to be more productive than countries which only produce for the domestic market. As a result of liberalization and globalization, a country's economy has become much more closely associated with external factors such as openness. The benefit of international trade for economic growth and development is difficult to understate. Imports bring additional competition and variety to domestic markets, benefiting consumers; and exports enlarge markets for domestic production, benefiting business. Trade exposes domestic firms to the best practices of foreign firms and to the demand of discerning customers, encouraging greater efficiency. Trade gives firms access to improved capital inputs such as machine tools, boosting productivity and providing new opportunities for growth to developing countries. International trade deals with the economic and financial interdependences among nations; international trade is part of our daily life, and international trade plays a vital role in shaping economic and social performance and prospects of countries around the world, especially those of developing countries. No country has grown without trade.

The working of an economy in terms of growth rate and per capita income has been based on the domestic production, consumption activities and in conjunction with a foreign transaction of goods and services. Foreign trade has been an area of interest to decision-makers, policy maker as well as economists. It enables nations to sell their domestically produced goods to other countries of the world (Adewuyi, 2002).


Economic theorists like Smith have argued that countries engage in external trade to reap the gains that arise from specialized production with each country concentrating on the production of those goods and service that involve the least opportunity cost. Various studies on international trade recognize trade as a vital catalyst for economic development. For developing countries, the contribution of trade to overall economic development is immense, owing largely to the obvious fact that most of the essential elements for development such as capital goods, raw materials, and technical know-how, are almost entirely imported because of inadequate domestic supply. Increased domestic demand invariably solicits corresponding expansion in exports. To enhance export capacity, therefore, improved technology must be required, and this in turn further pushes up demand for imports.


This circle of activities has the tendency of pushing imports far ahead of exports and in consequence, exerts pressures on the balance of payments. Prolonged pressures on the balance of payments constitute constraints to economic development and thus, appropriate economic policy measures have to be put in place to streamline external trade transactions to conform to the desired goal of economic development. One of such policies is the external trade policy. External trade policy regulates external trade in line with the domestic requirements of a country.


7.1 Benefits of Foreign Trade

There are several economic benefits of trade that could accrue from foreign trade. Comparative cost theory has shown clearly that the greatest possible advantage from trade for all countries would be obtained if each nation devotes itself to what it can produce cheaply.

This brings about efficient allocation of resources because each country specializes in producing the commodities in which she has a comparative advantage over others. In relations to this theory through foreign trade, countries direct their factors of production to areas where they can produce more.


Though with foreign trade, total world output of commodities seems to increase. This increase in the world output, also increase the variety of goods available to consumers. And consumers have the chances of exercising their preference. Consequently standard of living would also increase.

Foreign trade also increases competition. A company shielded from foreign competitors is more likely to have market power, which in turn gives it the ability to raise prices above competitive levels. Opening up trade fosters competitions and gives the invisible hand a better chance to work its magic.

The transfer of technological advances around the world is often though to be linked to foreign trade. Since human capacities vary all over the globe, foreign trade brings about an exchange of ideas. All these ideas and qualities are transported from one country to the other through trade.


In Nigeria, foreign trade helps in no slam measure to accelerate economic growth. It has helped in the importation of machineries such as tractors, plows, industrial plants, and equipment. With all these equipment, Nigeria economy is able to increase her productivity and thus quicken economic growth. Foreign trade has been a major determinant of foreigner's investment in Nigeria. Foreign trade has helped in upgrading socio-economic value of citizens because through foreigner's investment, employment opportunities were created.


7.2 Problems of Foreign Trade

There are many problems in foreign trade. One of the problems is language, when goods are exported to a foreign country, the labels, informative literature, packing technical handout, should be prepared in the language of the country in which the goods are marketed.

There should also be salesmen who are versed with that language and know the habits and likings of the people.

Another problem is the issue of standardized units, in some countries of the world, the units of length; weight, capacity, and voltage are not the same. The exporters, therefore, shall have to see that the goods are prepared and supplied according to the standard specification of the importing country.


Sales in foreign currency are also one of the issues, every country has its own currency, which is not the legal tender in another country. Buyers abroad prefer to buy the goods in his own currency just as sellers prefer to sell in the currency of his own country. The exporter, therefore, has to calculate the selling price of the goods into the currency units of a country where the goods are sold taking into consideration due to fluctuations in the foreign exchange by hedging. Also, when goods are exported or imported a number of documents are to be prepared.


7.3 Foreign Trade and Trade Restrictions

Despite the numerous benefits that accrue to nations as a result of foreign trade, it could realize that many nations employed different tools which aimed at interfering with the international flow of goods and services. It could be noted that governments, to a large extent impose restrictions on their foreign trade.


However, a nation can try to increase its welfare at the expense of other nations by restricting trade. Trade restrictions could be classified as tariff and non-tariff: The import tariff has received the most attention. This is expressed as a percentage of the value of the imported commodity and is usually imposed to limit the volume of imports. A tariff may be imposed as a means of correcting an adverse balance of payments. If imports, duties may be imposed on imports to make them clearer and likewise reduce their volume.


A tariff may be imposed to turn the terms of trade and volume of trade in favor of the country imposing the tariff. Also, tariffs may be imposed to raise the level of employment in a country. It is argued that, if a tariff is imposed, more of the national income will be spent on locally produced goods, all other factors being constant. This will encourage local production and more employment opportunities will be created. The extent to which tariff will be effective depends on the degree of retaliation from other countries which are victims of the tools.Its effectiveness will also depend on the elasticity of demand for the product in question as well as the elasticity of demand of the foreign countries goods.


Moreover, non-tariff trade restrictions are imported quota, import licensing, embargo, foreign exchange control, devaluation and import monopoly. An import quota is a direct quantitative restriction on the importation of a commodity and has many of the effects of an import tariff. It specifies the quantity of goods that will come from different countries into a country. The country in question would fix the maximum amount of a commodity that can be imported during a period of time. When the amount to be imported has been determined, import licenses are then issued either to agents or supplying countries, stating the maximum amount each is permitted to import or supply. 


Quota and license enable a government to restrict import to essential quantities needed. If this instrument is not administered well, it could raise prices of the goods and services.


Devaluation as one of the instruments of trade restriction refers to an increase in the exchange rate from one par value to another. This normally stimulates the devaluing nation's exports, reduces its imports and improves the nation's balance of trade and payment. By increasing the price of a unit of the foreign currency, devaluation makes a nation's imports more expensive in terms of the domestic currency and its export cheaper to foreigners in terms of the domestic currency.


Other instruments are an embargo, which is a complete ban on the importation of certain goods. It is a straight forward way of trade restriction. Foreign exchange which is the importation power of importers, in the case of import monopoly, the government of a country takes over the importation of goods and imports only those that are extremely essential to the nation.


7.4 World Trade Organization and Trade in Nigeria

Nigeria became a founding member of WTO with the coming into effect of the Marrakech Agreement establishing the organization, in January 1995. However, Nigeria involvement in the multilateral trading system dates back to 1960, when the country formally joined the then General Agreement on Tariffs and Trade (GATT). The key objective of WTO is continuous liberalization of global trade rules which aimed at greater reduction of tariff and non-tariff barriers. WTO is guided by the principle of non-discrimination and increased trafficator or tariff bindings.


Nigeria is bound by the obligation she has undertaken under the WTO Agreements. By this, it could be inferred that the multilateral trading system must have impacted significantly on Nigeria's trade policy given the WTO's role of harmonizing global trade rules. Nigeria's level of implementations of its WTO obligations has to lead to streamlining of trade policy through tariff bindings and this ensures that levels of tariff reduction already attained are not reversed. With the WTO obligations, Nigeria bound all her agricultural tariff lines at the ceiling rate of 150 percent.


The wide range between the level of agricultural bound rates and the high level of unbound industrial tariffs makes Nigeria’s tariff profile highly increased.

Hence, the government’s decision to retain high tariffs and the continuous imposition of import band makes trade policy highly uncertain and unpredictable. This is measured against the WTO rules of a consistent, transparent, certain and predicable policy. Thus, this depicts a policy disconnection and contradiction. This disconnection and contradiction against WTO tenet arise due to the government effort to protect domestic industries.

7.5 Trade Polices and Foreign Trade in the Nigerian Context

Trade policy since the 1960’s has witnessed extreme policy swings from high protectionism in the first few decades after independence to its current more liberal stance (Adenikinju, 2005). Attempts were made to use trade policy to promote manufactured exports and enhance the linkages in the domestic economy to increase and stabilize export revenue and scale down the country’s reliance on the oil sector (Olaniyi, 2005). Trade policies were accordingly directed at discouraging dumping, supporting import substitution, stemming adverse movements in the balance of payment, conserving foreign exchange and generating government revenue (Bankole & Bankole, 2004).

During the first decade of independence, Nigeria pursued an import substitution industrialization strategy. This involved the use of trade policy to provide effective protection to local manufacturing industries, through quantitative restrictions and high import duties. Trade policy between 1970 and 1976 assumed a less restrictive stance ostensibly because of demands necessitated by the post-war reconstruction. Thus, only items that were regarded as nonessential consumer goods were restricted. Tariff rated on raw materials were reduced and quantitative restriction on spare parts, agricultural equipment and machinery were relaxed.


The 1960s and early 1970s also saw the application of exports such as cocoa, rubber, cotton, palm oil, palm kernel and groundnut. However, in 1973, these duties were eventually abolished, as a result of the oil boom and the need to promote agricultural export as part of the export diversification strategy. Furthermore, in 1981, there was a policy shift towards export promotion and a move to intensify the use of local raw materials in industrial production.

The central objective of trade policy was to provide protection for domestic industries and reduce the perceived dependence on imports; a means to that objective was a desire to reduce the level of unemployment and generate more revenues from the non-oil sector. Accordingly, tariffs on raw materials and intermediate capital goods were scaled down.

In addition, 1986 depicts a significant shift in trade policy towards trade liberalization. This is attributable to the adoption of structural adjustment programmes. The period provided for a seven-year (1988-1994) tariff regime with the objective of achieving transparency and predictability of tariff rates. Imports under the regime this, attached ad valorem rates. A new seven-year (1995-2001) tariff regime succeeded the previous regime. The tariff structure over the period 1988-2001 increased import duties on raw material and on intermediate and capital goods, while tariffs on consumer goods were slightly reduced.

Nigeria's trade policy regime as currently contained in the national economic empowerment and development strategy (NEEDS) and trade policy documents, has been geared to enhancing the competitiveness of domestic industries, with a view to encouraging local value-added and promoting as well as diversifying exports. The mechanism adopted to achieve this was a gradual liberation of trade.


Current reform packages are therefore designed to allow a certain level of protection of domestic industries and enterprise. This has translated into tariffs escalation, with high effective rates in several sectors and lower imports duties on raw material and intermediate goods unavailable locally. This policy perspective has also led to the application of relatively high import duties on finished goods which compete with local production.

Despite various policies adopted in Nigeria in different years, trade policy still suffers some drawbacks. Trade negotiations are becoming increasingly complex and hence, even more, challenging for trade policy formulation. The challenge of institutional and human capacity is daunting. The trade ministry which has statutory responsibility for external trade relations lacks the requisite level of skills to effectively engage in the trade policy negotiation process. There seems not to be any standard programmed designed for training and skills acquisition in trade negotiations.


Training for policy making and trade negotiations requires specially designed programmes.

Furthermore, the ministry, which runs the affairs of trade policy, remains ill-equipped owing to lack of infrastructure and lack of a conductive environment for effective operations. This is partly due to poor finding for the ministry. In spite of the elaborate mechanism already put in place, there is lack of co-ordination among government establishments and between government and non-state actors. Co-ordination has not been very effective. 
7.6 Theoretical Review

7.6.1 Mercantilist Trade Theory
Mercantilist provided the earlier idea on foreign trade. The doctrine was made up of many features. It was highly nationalistic and considered the welfare of the nation as of prime importance. According to the theory, the most important way for a nation to have become rich and powerful is to export more than its import. Some of the mercantilism is Jean Baptiste Colbert and Thomas Hobbes. It was understood then, that, the most important were in which a country could be rich was by acquiring precious metals such as gold. This was achieved by ensuring that the volume of export was better than the volume of import.


Trade has to be controlled, regulated and restricted. The country was expected to achieve a favorable balance of payment. Tariffs, quotas, and other commercial policies were proposed by the mercantilism to minimize imports in order to protect a nation's trade position. Mercantilism did not favor free trade.Mercantilism belief in a word of conflict in which the state of nature was a state of war. The need for regulation to maintain order in human affairs and economic affairs were taking for granted. To the mercantilist, the world wealth was fixed. A nation’s gain from trade was at the expense of its trading partners that are, not all national could simultaneously benefit from trade.

Towards the end of 18th century, the economic policies of mercantilism came under strong attack. David Hume criticized the favorable trade balance as being a short-run phenomenon which could be eliminated automatically overtime. The other nation is likely to retaliate. Mercantilism was also attacked for their static view of the world economy. Adam Smith also criticized the nation that the world wealth is fixed with the advantages of specialization and division of labor. With specialization and division of labor, the general level of productivity within a country will increase.


Despite the criticism faced by the foundation of mercantilism, mercantilism is still alive today. New mercantilism now emphasized employment rather than holding some gold. They also postulate that exports are beneficial as jobs are provided domestically. Import is considered bad as jobs are taken away and transferred to the foreign workers. To the new mercantilist, trade is a zero-sum activity which a country must loose for the other to gain.


And that there is no acknowledgment that trade can provide benefits to all countries.

7.6.2 Absolute Advantage Trade Theory

The theory of absolute cost advantage was propounded by Adam Smith in his famous book. "Wealth of Nation" 1776. The theory emerges as a result of the criticism levied against mercantilism. He advocated free trade as the best policy for the nations of the world. Smith argued that with free trade each nation could specialize in the production of those commodities in which it could produce more efficiency than the other nations, and import those commodities in which it could produce less efficiently.


This international specialization of factors in production would result in an increase in world output, which would be shared by the trading nations. Thus, a nation need not gain at the expense of other nations, all nations could gain simultaneously.


In other words, according to the theory, a nation should specialize in the production of export of commodities in which it has lower cost or absolute cost advantages over others. On the other hand, the same country should import a commodity in which it has higher cost or absolute cost disadvantage.

7.6.3 Comparative Advantage Theory

Absolute advantage fails to analyze where a country has comparative advantage in the production of two goods, will trade still be necessary or beneficial to the country in question? David Ricardo tackled this question. Ricardo was the first to demonstrate that external trade arises not from a difference in absolute advantage but from the difference in comparative advantage. By "comparative advantage" is meant by "greater advantage". Thus in the context of two countries and two commodities, a trade would still take place even if one country was more efficient in the production of both commodities, provided the degree of its superiority over the other country was not identical for both commodities.


Ricardo assumed the existence of two countries, two commodities, and one factor of production, labor. He assumed that labor was fully employed and internationally immobile and that the product and factor of prices were perfectly competitive. There are no transport costs or any other impediments to trade, In the context of a model of two countries, two commodities and one factor of production, Ricardo obtained the result that a country will tend to export the community in which it has a comparative disadvantage. Since comparative costs are the other side of comparative advantage, the theory could be expressed in terms of comparative costs.


Specifically, the theory now states that a country will tend to export the commodity whose comparative cost is lower in production and the comparative cost is higher in pre-trade isolation.


The theory also assumed the level of technology to be fixed for both nations. Different nations may use different technology but all firms within each nation utilize a common production method for each commodity. It also assumed that trade is balanced and rolls out the flow of money between nations. The distribution of income within a nation is not affected by trade.

A most assumption of the Ricardian theory is unrealistic. The theory is based on a labour theory of values which states that the price of the values of a commodity is equal to or can be inferred by the quality of labor time going into its production process. Labour theory of values is based on-labor is the only factor of production. Labour is used in the same fixed proportion in the production of all commodities. Labour is homogenous. This underline proposition is quite unrealistic, because as labor is categorized into skilled, semi-skilled and unskilled labor, there are other factors of production. Despite its shortcomings, the law of comparative advantage cannot be discarded off because it found application in the study of economics. The law is valid and can be explained in terms of opportunity cost in the modern theory of trade.


7.6.4 Modern Theory of Trade

The Heckscher-Ohlin theory explains why countries trade in goods and services with each other. One condition for trade between two countries is that the countries differ with respect to the availability of the factors of production. They differ if one country, for example, has many machines (capital) but few workers, which another country has a lot of workers but few machines. According to the Heckscher-Ohlin theory, a country specializes in the production of goods that it is particularly suited to produce. Countries in which capital is abundant and workers and few, therefore, specialize in the production of goods that it is particularly require capital.


Specialization in production and trade between countries generates, according to this a higher standard-of-living for the countries involved. The production of goods and services requires capital and workers. Some goods require more capital – technical equipment and machinery - and are called capital intensive. For instance, these goods are cars, computers, and cell phones, other goods require less equipment to produce and rely mostly on the efforts of the workers. These goods are called labor intensive. Examples of these goods are shoes and textile products such as jeans. The Heckscher-Ohlin theory says that two countries trade in goods with each other (and thereby achieves greater economic welfare), if the following assumptions hold; the major factors of production, namely labour and capital are not available in the same proportion in both countries, the two goods produced either require relatively more capital or relatively more labour, labour and capital do not move between the two countries, there are no costs associated with transporting the goods between countries.


The citizens of the two trading countries have the same needs. Of the above conditions, the central one is the assumption that capital and labor are not available in the same proportion in the two countries. This condition leads to specialization. The country with relatively more capital, specializes - but not necessarily fully – in a production of capital-intensive goods (which it exports in exchange labor for intensive goods) while the country with relatively little capital specializes in Production of labor-intensive goods (which it exports in exchange for capital-intensive goods). According to the theory, the more different the countries are regarding the capital-to-labor ratio – the greater the economic gain from specialization and trade.


7.7 Empirical Review

Several Studies have been carried out to provide clear evidence on the nexus trade across the border has on the economy. Previous findings on the Nigerian economy are majorly reviewed, examples are; Ogbokor (2001), investigated the macroeconomic impact of oil exports on the economy of Nigeria. Utilizing the popular OLS technique, he observed that economic growth reacted in a predictable fashion to changes in the regressors used in the study. He also found that a 10% increase in oil exports would lead to 5.2% jump in economic growth. He concluded that export-oriented strategies should be given a more practical support.


Oviemuno (2007), looks at international trade as an engine of growth in developing countries taking Nigeria (1960-2003) a case study, he uses four important variables, which are export, import, inflation, and exchange rate. The findings show that Nigeria's export value does not act an engine of growth in Nigeria, Nigeria's import value does not act as an engine of growth in Nigeria and that Nigeria's inflation rate does not act an engine of growth in Nigeria. Egwaikhide (1991) examines the qualitative effects of export (non-oil) expansion on Nigeria's economics growth over the period, 1960 to 1983 based on simulation experiment, he observes among others, that a 75 percent rise in non-oil export-led to 1.4 percent increase in real GDP. He concludes that there is need to promote export in order to enhance GDP growth in Nigeria.


Omoju & Adesanya (2012) examined the impact of trade on economic growth in Nigeria using data from 1980 to 2010. Adopting Ordinary Least Square (OLS) technique, the study showed that trade, foreign direct investment, government expenditure and exchange rate have a significant positive impact on economic growth.

Emeka, Frederick, and Peter (2012) evaluated the role of trade on Nigeria's economy for the period 1970 to 2008. By applying a combination of bi-variate and multivariate models, the relationships between the selected macroeconomic variables were estimated. The findings indicated that exports and foreign direct investment inflows have a positive and significant impact on economic growth. The study suggested that there should be a congruence of exports and fiscal policies, towards a greater diversification of non-oil exports by the Nigerian government in order to attain the desired growth prospects of external trade.

Adenugba & Dipo (2013) evaluated the performance of non-oil exports in the economic growth of Nigeria from 1981 to 2010. Findings revealed that non-oil exports have performed below expectations; hence, giving reason to doubt the efficacy of the export promotion strategies that have been adopted. They pointed out that the economy is still far from diversifying from crude oil exports and as such the crude oil sub-sector continues to be the single most important sector of the economy. Edoumiekumo & Opukri (2013) examined the contributions of international trade (proxy with export and import values) to economic growth in Nigeria measured by real gross domestic product (RGDP). Time-series data obtained for a period of 27years was analyzed using Augmented Dickey-Fuller (ADF) test, Ordinary Least Square (OLS) statistical technique, Johansen co-integration test and Granger Causality test. The results showed that positive relationship exists between the variables and there is co-integration among the variables. The Granger Causality test realized a uni-directional relationship showing that RGDP Granger cause export and import Granger cause RGDP and export.

Evidence from empirical studies from other countries also reviewed. Li, Chen, and San (2010) conducted a research on the relationship between foreign trade and the GDP growth of East China for a period 1981-2008. Adopting the unit root test, co-integration analysis, and error correction model, they found out that foreign trade is the long-term and short-term reason of GDP growth, but no evidence proved that there exists long-term stationary causality between import trade and GDP. Sun and Heshmati (2010) evaluated the effects of international trade on China's economic growth through examining improvement in productivity. Both econometric and non-parametric approaches were applied based on a 6-year balanced panel data of 31 provinces of China from 2002-2007. The study demonstrated that increasing participation in the global trade helped China reap the static and dynamic benefits, stimulating rapid national economic growth. Also, it revealed that both international trade volume and trade structure towards high-tech exports resulted in positive effects on China's regional productivity. 

Adak (2010) investigates the international trade and Economic Growth interrelation in Turkey using econometric model and Ordinary Least Square test with the analysis covering the years between 1981 and 2007 and found that there is a significant causality between foreign trade and economic growth. He observed that the foreign trade growth rate has pushed up the GDP per capita growth rate in the past three decades after them integration of Turkey into the global economy. The findings affirm that international trade is one of the economic growth determinants of Turkey.

Javed, Qaiser, Mushtaq, Saif-ullaha & Iqbal (2012) examined the impact of total exports to GDP ratio, import to GDP, terms of trade, trade openness, investment to GDP ratio and inflation on the Paskitani economy using time-series data from1973-2010. Employing Chow test and Ordinary Least Square method, the estimated results revealed that all the explanatory variables have a positive and significant impact on Pakistan. The study further discovered that an increase in the import of raw-materials boosted production, employment, and output of Pakistan. Ulasan (2012) revisited the empirical evidence on the relationship between trade openness and long-run economic growth over the sample period 1960-2000 in contrast to previous studies focusing mainly on the period 1970-1990. The study used various openness measures suggested in literature rather than relying on a few proxy variables. The findings from the cross-country analysis indicated that many openness variables are positively and significantly correlated with long-run economic growth. The study suggested that because of the fragility of the openness-growth association, the significance of openness variables disappear once other growth determinants, such as institutions, population heterogeneity, geography and macroeconomic stability are accounted for. Rahmaddi & Ichihashi (2011) investigated the relationship between exports and economic growth in Indonesia during the period 1971-2008, using a VAR model. Based on the analysis conducted in a VECM framework, the authors found that exports and economic growth exhibit bi-directional causal structure, and concluded that both exports and economic growth are significant to the economy of Indonesia.


Tan (2012) conducted a study on the relationship between international trade and economic growth in Singapore. The scholar used OLS procedure to test the cross country dataset for the period 1965 to 2009 and concluded that terms of trade have a positive impact on economic growth. Similarly, Javed, Qaiser, Mushtaq, Sai-ullaha & Iqbal (2012) did a study on the effect of international trade on economic growth in Pakistan. The OLS procedure was used on the time series data for the period 1973 to 2010. The conclusion made was that trade openness has a positive and significant influence on economic growth in the Pakistan economy.


Sarbapriya Ray (2011) examined the relationship between foreign trade and economic growth in India, using annual data over the period 1972 – 2011. The co-integration and Granger causality tests confirmed that economic growth and foreign trade are co-integrated, implying the existence of a long-run equilibrium relationship between the two, and the presence of bi-directional causality which runs from economic growth to foreign trade and vice versa. Safdari, Mehrizi & Dehqan-Niri (2012) investigated the long-run relationship between foreign trade and economic growth in Iran between 1975 and 2008 using a Vector Autoregressive model (VAR) and data for real gross domestic product, total population, trade volume, gross capital formation and tariffs. Their results showed that total population, trade volume, gross capital formation and tariffs have a positive effect on economic growth.


Our study builds on the more recent time series study of trade and growth. Basically, we use GDP as a proxy for economic growth while we utilize non-oil exports, oil export, non-oil import, oil import and balance of payment as proxies for international trade. 
8. Research Methodology

8.1 Research Design

Research design refers to the arrangement of conditions for collection and analysis of data in a manner that aims to combine relevance to the research purpose with economy in the procedure (Babbie, 2002). A research design is a framework that indicates the type of information that is needed for the research, the source of such information and the method of collection (Udeagha, 2003).

This research design employed is the ex-post facto design which seeks to establish the cause-effect relationship and the variables of interest are not under the control of the researcher and therefore cannot be manipulated.


8.2 Sources of Data

Data for the empirical study are secondary data sourced from the CBN Statistical Bulletin from 1981-2015

8.3 Population of the Research
The population of this study shall cover economy in Nigeria from the Period of 1981 to 2015.

8.4 Method of Data Analysis

The statistical technique adopted for this study is multiple regression econometric procedure with the aid of E-view package. The t-test was employed to ascertain the significance of each of the constant parameters, while the diagnostic test based on the coefficient of determination (R2) was used to check for the goodness of fit of the model. The Durbin-Watson statistic will be employed also to measures the serial correlation in the residuals. If the DW is less than 2, there is evidence of positive serial correlation. A DW statistic output that is very close to one indicates the presence of serial correlation in the residuals.
8.5 Model Specification

In this study, we used non-oil export, oil export, non-oil import, oil import and balance of payment as our independent variable which is regressed against economic growth measured by GDP. The functional form on which our econometric model is given thus: 


GDP=F(NOI, OI, NOE, OE)………………………………………….…….(1)

The econometric model is specified as follows:

GDP=β0+ β1NOI+β2OI+β3NOE + β4OE+ μ……………..……….…………(2)

Where:

GDP=Gross Domestic Product

NOI= Non-oil import


OI= Oil Import

NOE= Non-oil export 


OE= oil export

Where β0>0, β1>0 β2>0 β3>0 and β4>0

β0, β1, β2 β3, β4, β5= constant parameters and μ = the error term

8.6 Test of Hypothesis

Null Hypothesis H0 : β1= β2= β3= β4= β5= 0

Alternative Hypothesis H1: β1 or β1 or β1or β1 or β1 or any four of them or all are non zero

At least one of them is significant at 5% degree of freedom. The F-test is adopted for the overall significance of the model.The higher the value of the F-statistics, the greater the greater the overall significance of the estimated regression. If F-calculated is greater than the F-tabulated, the F-statistics shows a higher degree of association between the dependent variables.

9. Data Presentation 

The data for this study on the economic variables are presented in Table1 in appendix A

Table 2: Descriptive Statistics

	
	GDP
	OIL_IMPORT
	NON_OIL_IMPORT
	OIL_EXPORT
	NON_OIL_EXPORT

	 Mean
	 17827.15
	 612.4145
	 2055.931
	 3823.662
	 206.6006

	 Median
	 4189.250
	 175.8542
	 661.5645
	 1212.499
	 24.82290

	 Maximum
	 94144.96
	 3064.256
	 9350.843
	 14323.15
	 1130.171

	 Minimum
	 94.32502
	 0.051800
	 5.069700
	 7.201200
	 0.203200

	 Std. Dev.
	 28092.36
	 901.9035
	 2845.097
	 4886.111
	 337.5611

	 Skewness
	 1.688211
	 1.581999
	 1.341275
	 1.027825
	 1.533366

	 Kurtosis
	 4.405487
	 4.310943
	 3.385043
	 2.585040
	 3.849571

	

	 Jarque-Bera
	 19.50612
	 17.10545
	 10.71048
	 6.413582
	 14.76797

	 Probability
	 0.000058
	 0.000193
	 0.004723
	 0.040486
	 0.000621

	
	
	
	
	
	

	 Sum
	 623950.4
	 21434.51
	 71957.59
	 133828.2
	 7231.022

	 Sum Sq. Dev.
	 2.68E+10
	 27656616
	 2.75E+08
	 8.12E+08
	 3874214.

	
	
	
	
	
	

	 Observations
	 35
	 35
	 35
	 35
	 35


Source: E-view Output, Version 9

The descriptive statistic presented in table 2 shows the mean, range, minimum, maximum and standard deviation of all the variables under consideration. The table indicates a mean GDP, oil import, non oil import, oil export and non-oil export trade as a measure of international trade are N17,827.15 billion, N 612.4145 billion, N2,055.931 billion, N3823.662 billion and N206.6006 billion respectively, with minimum of N94.32502 billion, N0.051800 billion, N5.069700 billion, N7.201200 billion and N0.203200 billion respectively.This show a clear clue of the activities of international trade in Nigeria under the period of investigation. However, with a maximum of N94,144.96 billion, N3,064.256 billion, N9,350.843 billion, N14323.15 billion, and N1130.171 billion respectively show that international trade and economic growth is fairly well encouraging. This gives a clue of the performance of international trade and economic growth for the years under examination.
9.1 Data Analysis
The impact of International Trade (measured by Oil Import, Non-Oil Import, Oil Export and Non-Oil Export) on Economic Growth (Measured by Gross Domestic Product) 

Table 3: Multiple Regressions
	Dependent Variable: GDP
	
	

	Method: Least Squares
	
	

	Date: 01/18/17   Time: 13:19
	
	

	Sample: 1981 2015
	
	

	Included observations: 35
	
	

	Variable
	Coefficien   t
	Std. Error
	t-Statistic
	Prob.  

	C
	-141.9804
	1218.034
	-0.116565
	0.9080

	OIL_IMPORT
	4.549808
	4.935327
	0.921886
	0.3639

	NON_OIL_IMPORT
	8.946531
	1.114886
	8.024613
	0.0000

	OIL_EXPORT
	-2.194348
	0.692323
	-3.169546
	0.0035

	NON_OIL_EXPORT
	25.07136
	11.90185
	2.106510
	0.0436

	

	R-squared
	0.968471
	    Mean dependent var
	17827.15

	Adjusted R-squared
	0.964267
	    S.D. dependent var
	28092.36

	S.E. of regression
	5310.330
	    Akaike info criterion
	20.12426

	Sum squared resid
	8.46E+08
	    Schwarz criterion
	20.34645

	Log-likelihood

	-347.1745
	    Hannan-Quinn criter.
	20.20096

	F-statistic
	230.3770
	    Durbin-Watson stat
	1.114779

	Prob(F-statistic)
	0.000000
	
	
	


From Table 3 above, the result shows that all the explanatory variables significantly impact on Gross Domestic Product. It could be also observed that oil import on GDP contributes (4.549) this mean that for every unit change in oil import there is a corresponding change of 4.549 in GDP. On the basis of a prior expectation, the coefficient is incorrect and positively signed. Therefore, the result revealed that oil import is insignificantly affecting the economic growth of the Nation. The result of non-oil import also shows that non-oil import on GDP contributes 8.946.This means that for every unit change in non-oil import there is a corresponding change of 8.946 in GDP. On the basis of a prior expectation, the coefficient is incorrect and positively signed. Therefore, the result revealed that non-oil import is significantly affecting the economic growth of the Nation. Looking on the Oil export, the result shows that oil export on GDP contributes -2.19. Meaning that for every unit change of Oil export there is a corresponding unit change of -2.19, showing an inverse relationship between oil export and Gross Domestic Product in Nigeria. On the basis of a prior expectation, the coefficient is incorrect and negatively signed. Therefore, the result revealed that oil export is negatively and significant on economic growth of Nigeria. The result further, shows that the nation oil export contributes most to the economic Growth of Nigeria. The value of 25.07 indicates that for every unit change of non-oil export there is a corresponding unit increased of 25.07 on GDP in Nigeria. On the basis of a prior expectation, the coefficient is correct and positively signed. Therefore, showing that non-oil export positive and significantly affect the growth and development of the Nation.

Meanwhile, the coefficient of determination (R2) of the multiple regressions is 0.968, which implies that the explanatory variables which are oil import, non-oil import, oil export and non-oil export, significantly impact the dependent variable (GDP). This means that the impact of International Trade on Nigerian economic growth (GDP) explain or account 96.8% influence or movement on the real gross domestic product of Nigeria, while only 3.2% account could be explained by other variables or factors not included in the model. The Adjusted R2 of 0.96 is close to the R2 value of 0.968.Meaning that the model is fit for making a generalization. Furthermore, the value of F= 230.3770 indicates the models' goodness of fit to the data.Also looking at the D.W of 1.11 shows an absence of positive auto correlation among the variables in the model. Finally, looking at the p-value of International Trade is < 0.05 at 5% degree of freedom. Therefore, the study concluded that there is a positive significant relationship between International Trade and economic growth (GDP) in Nigeria.


All explanatory variables (oil import, non-oil import, oil export and non-oil export) were significantly joint predictors of economic growth in Nigeria. For instance, non-oil export is positive and significant to GDP. This implies that an increase in non-oil export will boost economic growth. The finding agrees with Egwaikhide (1991); Emeka, Federick & Peter (2012); and Adenugha & Dipo (2013). They found that non-oil export Trade had a positive impact on economic of Nigeria. But it has not contributed meaningfully to economic growth and development due to the low output of the manufacturing sector and undeveloped Local Market Base.

The overall result of International Trade on economic growth indicates a positive significant relationship with GDP. This finding is in line with Edoumiekumo & Opukri (2013), Adak (2013), Hehmati (2010), San (2010), and Iqbal (2012). They found a positive significant relationship between international Trade and economic growth in Nigeria.


10. Recommendation and Conclusion

Based on the empirical findings of this study, the following recommendations are made for the purpose of effective policy formulations in the area of international trade and economic Growth.

· International Trade should be on the development of dynamic, rather than a static comparative advantage, emphasis should be on the promotion of non-primary exports and non-oil export i.e. manufactured goods. International trade strategy must be based on the recognition of the fact that the international economic environment is not a "level playing field" government has to take necessary measures to enhance productivity and competitiveness of enterprises in the export sector, i.e. upgrading infrastructures, enhancement of human capital development, development and improvement of technology through increase allocation of resources to research and development through government spending.


· Central Bank of Nigeria should intensify the deregulation policy of the exchange rate sector of the country made available foreign currency to exporters and investors. Promotion of exports within the context of sub-regional and regional economic integration should be vigorously pursued to expand Nigerian international market and the importation policy of the government should adhere to in order to control dumping and to encourage the local investors.

· Monetary authority of the country should maintain a double-digit inflation and interest rate, for now, to motivate foreign investors and the commercial banks until development level of Nigeria economy reach a significant level where both inflation and interest rate can be reduced to a single digit or zero-free.


· Excise duties should be lowered so as to encourage local industries to export their goods and services.
· A lifting of trade barriers on local output should not be followed by the introduction of new ones. Only the importation of capital goods that are essential should be encouraged since not all importation are necessary for economic growth.

· The economy also has to fight seriously against the monocultures export syndrome
· A government should ensure political and macroeconomic stability so as encourage investment, both local and foreign and guarantee business survival. 


· The government should encourage export diversification. Non-oil sector exports should be encouraged and concentration on oil sector export should be minimal.
In conclusion, since all, the econometric test applied in this study show a statistically significant relationship between the dependent (GDP) and independent variables (oil import, non-oil import, oil export and non-oil export) from the model. We accept that international trade (oil import, non-oil import, oil export and non-oil export) has significant implications on the economic growth in Nigeria. Therefore, the empirical findings reveal that international trade is a catalyst for economic growth.
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Appendix A 

Table 1 Annual Oil Import, Annual Non-Oil import, Annual Oil Export, Annual Non-oil Export and Real Gross Domestic Product (GDP) in Nigeria (1981 – 2015)  

	Year
	GDP(N’ Billion)
	Non-OilImport(N’ Billion)
	Oil Import (N’ Billion)
	Non-Oil Export(N’ Billion)
	Oil Export (N’ Billion)

	1981
	94.33
	12.7
	0.1
	0.3
	10.7

	1982
	101.01
	10.5
	0.2
	0.2
	8.0

	1983
	110.06
	8.7
	0.2
	0.3
	7.2

	1984
	116.27
	6.9
	0.3
	0.2
	8.8

	1985
	134.59
	7.0
	0.1
	0.5
	11.2

	1986
	134.60
	5.1
	0.9
	0.6
	8.4

	1987
	193.13
	14.7
	3.2
	2.2
	28.2

	1988
	263.29
	17.6
	3.8
	2.8
	28.4

	1989
	382.26
	26.2
	4.7
	3.0
	55.0  

	1990
	472.65
	39.6
	6.1
	3.3
	106.6

	1991
	545.67
	81.7
	7.8
	4.7
	116.9

	1992
	875.34
	123.6
	19.6
	4.2
	201.4

	1993
	1,089.68
	124.5
	41.1
	5.0
	213.8

	1994
	1,399.70
	120.4
	42.2
	5.3
	200.7

	1995
	2,907.36
	599.3
	155.8
	23.1
	927.6

	1996
	4,032.30
	400.4
	16.2
	23.3
	1,286.2

	1997
	4,189.25
	678.8
	166.9
	29.2
	1,212.5

	1998
	3,989.45
	661.6
	175.9
	34.1
	717.8

	1999
	4,679.21
	650.9
	211.7
	19.5
	1,169.5

	2000
	6,713.57
	764.2
	220.8
	24.8
	1,920.9

	2001
	6,895.20
	1,121.1
	237.1
	28.0
	1,839.9

	2002
	7,795.76
	1,151.0
	361.7
	94.7
	1,649.4

	2003
	9,913.52
	1,681.3
	398.9
	94.8
	2,993.1

	2004
	11,411.07
	1,668.9
	318.1
	113.3
	4,489.5

	2005
	14,610.88
	2,003.6
	797.3
	106.0
	7,140.6

	2006
	18,564.59
	2,397.8
	710.7
	133.6
	7,191.1

	2007
	20,657.32
	3,143.7
	768.2
	199.3
	8,110.5

	2008
	24,296.33
	4,277.6
	1,315.5
	525.9
	9,861.8

	2009
	24,794.24
	4,411.9
	1,068.7
	500.9
	8,105.5

	2010
	54,612.26
	6,406.8
	1,757.1
	711.0
	11,300.5

	2011
	62,980.40
	7,952.3
	3,043.6
	913.5
	14,323.2

	2012
	71,713.94
	6,702.3
	3,064.3
	879.3
	14,260.0

	2013
	80,092.56
	7,010.0
	2,429.4
	1,130.2
	14,131.8

	2014
	89,043.62
	8,323.7
	2,215.0
	953.5
	12,007.0

	2015
	94,144.96
	9,350.8
	1,725.2
	660.7
	8,184.5


Source: CBN Statistical Bulletin, 2015
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