id	keyword
hungeobull-2885	population
hungeobull-2885	age
hungeobull-2885	ageing
hungeobull-2885	countries
hungeobull-2885	europe
hungeobull-2885	european
hungeobull-2885	coeffi
hungeobull-2885	structure
hungeobull-2885	people
hungeobull-2885	fertility
hungeobull-2885	cient
hungeobull-2885	number
hungeobull-2885	values
hungeobull-2885	group
hungeobull-2885	diff
hungeobull-2885	infl
hungeobull-2885	population ageing