Year	% of merchandise imports
1970	68.28391898327388
1971	62.54011526455496
1972	61.856570273335045
1973	62.55732519701982
1974	56.1441271595864
1975	53.98808945754693
1976	52.776258718416244
1977	56.39426299226867
1978	57.842945498594844
1979	59.6407186506239
1981	58.72466693521823