Year	% of total merchandise exports
1968	0.019541231999518984
1969	0.027910891259167656
1970	0.02756596748064021
1971	0.06610940091904234
1972	0.0396575367851451
1973	0.04166126613216806
1974	0.030999845000774996
1975	0.2542703733185959
1977	0.007159765696667576
1978	0.008432882482640602
1980	0.132244729364659
1981	0.5871603323777252
1982	0.9425623452626817
1983	0.12880260415446945
1984	0.01752790042377582
1985	0.017527900424012855
1986	0.15271254743158577
1987	0.013352113561034868
1988	0.1447418923730734
1989	0.15415160517676213
1990	0.035691440320529684
1991	0.004910031580641128
1992	0.01186428464015183
1993	0.0789714583164628
1994	0.0038595816872650027
1995	1.777106215294713
1996	0.007426582974804807
1997	0.047169062581749105
1998	0.07497357864580724
1999	0.6817694249256099
2018	0.0024375871660112384