Year	% of merchandise imports
1970	20.814941075231335
1971	24.10679997668968
1972	25.564471495015837
1973	24.935687202169333
1974	24.0190999594981
1975	28.722851805239173
1976	30.89675228087107
1977	27.838422048769818
1978	25.625487483235798
1979	23.568561932225187
1981	26.10295462323856