Year	% of merchandise exports
1970	5.764615926086263
1971	2.4433713577952525
1972	2.4947701009560084
1973	3.9557254867291682
1974	8.067528810560159
1975	4.951189314377387
1976	2.2285330323134773
1977	1.6246962017502982
1978	1.8373108306439763
1979	1.086870904941539
1981	0.8508155882022748
1988	1.4174377594190612
1989	0.8581515715105842
1990	0.5403541379870747
1991	1.0185568627377413
1992	0.3475165827796545
1993	0.14002199124825948
1994	0.2531052376284472
1995	0.28571213226510944
1996	0.6791841270576251
1997	0.23376993906008445