id	keyword
cpos-626	fertility
cpos-626	russia
cpos-626	births
cpos-626	age
cpos-626	women
cpos-626	policy
cpos-626	second
cpos-626	period
cpos-626	transition
cpos-626	cohort
cpos-626	population
cpos-626	zakharov
cpos-626	children
cpos-626	family
cpos-626	data
cpos-626	years
cpos-626	percent
cpos-626	rates
cpos-626	changes
cpos-626	sergei
cpos-626	number
cpos-626	state
cpos-626	decades
cpos-626	countries
cpos-626	research