Year	% of total merchandise exports
1970	6.25
1971	12.5
1972	11.11111111111111
1973	5.263157894736842
1976	26.666666666666668
1977	38.88888888888889
1978	30
1979	33.33333333333333
1980	18.421052631578945
1981	17.24137931034483
1982	8.108108108108109
1983	3.225806451612903
1984	26.923076923076923
1985	32.6530612244898
1986	37.95029506359254
1987	24.175765610639267
1988	39.15103623364852
1989	2.6585643749101315
1990	2.9347308908526095
1991	9.950626254519632
1992	9.409119863094883
1993	5.778616968385795
1994	7.296493415577286
1995	3.4358034501570165
1996	4.797695234701582
1997	0.4390142983538961
1998	0.0013774782313252958
1999	0.06844732246742669
2000	21.83185830753584
2001	2.011089677645847
2002	5.89291560544339
2003	1.4345260921698497
2004	0.8498042529585362
2005	0.5364844642994988
2006	4.62526207870283
2007	0.7149443239662416
2008	13.33373583813144
2009	0.606076583730406
2010	0.6641178117090527
2011	3.3857122145827785
2012	1.7684267323356717
2013	0.34140719052646845
2014	1.001302874208976
2015	0.09424539692734259
2016	0.15178061046792812
2017	0.8691969927116421
2018	0.1741874026839661
2019	1.1464083579800366
2020	0.7651601671540436