Year	% of total merchandise exports
1974	2.7843226276115254
1975	2.5057364237970137
1976	6.195553972870134
1977	4.895714207918096
1979	20.344849922673944
1980	24.291776387514467
1981	19.41195992471379
1982	25.01637127102539
1983	23.82557270718408
1984	21.200068442513132
1985	21.200068447551875
1986	21.200068447183096
1987	21.200068447561073
1988	77.0596757456935
1989	77.05967574174255
1990	84.28812145691813
1991	7.312291450909089
1992	7.606410481969214
1993	6.967989951891666
1994	61.055559850277284
1995	62.505905218796784
1996	68.71489373636008
1997	55.48286070575686
1998	61.09404617188847
1999	63.609156469875494
2000	0
2001	0
2002	0.002138528755976134
2003	0.013017994431523856
2004	0.00509620962806201
2005	0.00010411715212229205
2006	0.16269638954358442
2007	0
2008	0.00017708006779099429
2009	0
2010	0.007045929592730899
2011	0.000605969035925923
2012	0.0014870962764396993
2013	0.00837724117980099
2014	0.00035321501535712604
2015	0.001878053608524594
2016	0.0016653513422318848
2017	0.0023063852408737174
2018	4.00805002174059E-05
2019	4.297676996597922E-05
2020	3.489337706915896E-05