Year	% of total merchandise exports
1971	0.03783400331047529
1972	0.1211596711380355
1973	0.07880459491407268
1974	0.2004008016032064
1975	0.011765275826510626
1976	0.02058937073735684
1977	0.01524003048006096
1978	0.009917814378186098
1979	0.015238482247168181
1980	0.008196522245968525
1986	4.678957985359448
1987	5.03594393680254
1988	3.8828718084222413
1989	1.6636304674210078
1990	1.8468694398930892
1991	1.2920853597576398
1992	0.3237566925338487
1993	0.5749715238045042
1994	0.6708164443124006
1995	0.5324842343425976
1996	0.48831130343104767
1997	1.2653946520027712
1998	1.151139861823913
1999	1.1300965672495051
2000	0.706188870265261
2001	1.4352060584530928
2002	1.2815354647591453
2003	0.8906920789917467
2004	0.5786152530893515
2005	2.1512152892359064
2006	1.9535957534739559
2007	3.9864321752077188
2008	2.933400746762556
2009	9.687441105176205
2010	11.436615373371344
2011	10.701185957773646
2012	6.144144219468366
2013	8.551839057996595
2014	7.001095719119683
2015	5.171283852837587
2016	4.997841245668729
2017	8.647293319050615
2018	7.129361056222305
2019	6.877840527452224
2020	6.877840522782945