Year	% of merchandise exports
1962	21.253867945467587
1966	8.270357183568262
1970	8.189720881274727
1971	8.30882782064204
1972	8.907893507615638
1973	9.091461865457068
1974	6.6055116048240405
1975	6.465242013584671
1976	9.811146508933781
1977	5.784580214888429
1978	2.1802170466353674
1979	9.214024929640427
1980	7.715827044146168
1981	1.898453518338282
1982	0.6812480742425058