Year	% of merchandise exports
1963	31.847360442891983
1967	17.13028548283249
1970	19.80343119872273
1971	17.93015095476178
1972	15.34310857054729
1973	18.40773378466938
1974	20.56990270966304
1975	14.999591049326305
1976	19.228668027791194
1977	19.77495918164901
1978	25.477079882522492
1979	27.269810554593736
1980	29.264267351802697
1981	23.570435920335814
1982	18.197402848979582
1983	22.87762781716949
1984	25.560104659502546