Year	% of total merchandise exports
1969	0
1970	6.521739130434782
1971	1.7543859649122806
1972	0
1973	0
1974	2.272727272727273
1975	5.319148936170203
1976	5.0359712230215825
1977	1.1111111111111007
1978	0
1981	1.3582804106545772
1982	0.4358247901322289
1983	0.9939863776625311
1984	5.8205849212214366E-09
1985	-1.738153478892809E-08
1986	-7.913129725490991E-09
1987	1.3358942556489434E-08
1988	0.09927297466158931
1989	0.07573045751406758
1990	0.31027251776724635
1991	0.1585157873901655
1992	0.5254428753456937
1993	0.14597416206265046
1994	0.037425689501036224
1995	-3.9035414794325606E-08
1996	-1.2025375686841432E-09
1997	6.30938807276573
1998	4.932735443908412
1999	1.775591767305449
2000	0.04120303542135675
2001	0.2530502194811348
2002	0.4323247959936358
2003	0.18304637065989118
2004	0.15383667412003438
2005	0.13156963919371123
2006	0
2007	0
2008	0.1381907087728721
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0.02022760557060641
2019	1.582670767489304
2020	3.7636356181090376