Year	% of total merchandise exports
1975	1.0638297872340425
1983	0.09939863823859635
1985	1.4507783365567675
1988	0.003309099412079958
1989	0.09589247361355217
1991	1.3708637337668794
1992	0.4535019825638465
1993	0.21623061554251724
1994	1.0738884486634481
1995	0.23658011194676531
1996	0.2204731095305131
1997	0.07601672368507163
2002	0.002816934771634619
2003	6.690512609058527
2005	0.1511309093793343
2006	0.5433558482420715
2007	2.0446265884225325
2008	1.3536535217650367
2009	0.5289906350795734
2010	3.422223455574949
2011	1.5488339979852934
2012	1.0870580112408568
2013	0.46157629657460214
2014	1.3503157595140582
2015	1.8004040805228767
2016	1.080095842663692
2017	0.02049369125197163
2018	0.5920274801153095