Year	% of merchandise exports
1970	51.70619714180078
1971	53.74278675056144
1972	51.66454549184877
1973	52.55798558277229
1974	45.02415940858234
1975	42.27861783563084
1976	44.57179478834913
1977	50.77687319325791
1978	48.35317971617298
1979	35.707675163236246
1981	29.505327624110507
1988	21.96929224748545
1989	27.230411654424397
1990	13.904145579900181
1991	14.57985250882851
1992	16.60545687732029
1993	13.8265689876193
1994	24.423525840522085
1995	37.475316088816854
1996	22.342883491923846
1997	15.461797460465409