Year	% of merchandise exports
1978	0.053024161120949306
1979	0.11669136103949927
1984	0.048955933048094154
1986	1.1822117325937729
1987	2.6218666853854473
1989	1.423131925440749
1990	24.03894285095794
1991	22.903379807150415
1992	5.0726919389375045
1993	5.600360827390909
1994	4.368861241412183
1995	2.0063362363088952
1996	6.390602468451428
1997	6.56755020114589
1998	7.088801904830621
1999	9.205456381793153
2005	1.5618484718735746
2007	0.2931729679104845
2008	1.8216103128810983
2009	4.4769353315451985
2010	1.326232426964509
2011	5.19486365249388
2013	3.0688471482117308
2014	2.2751327751422252
2015	0.0006893996018867168
2016	2.275139844760098
2017	0.5907104916487692
2018	0.11139406514799872
2020	3.2358933924135554E-05
2021	0.001692316926283126