Year	% of total merchandise exports
1981	2.636149234021682
1982	2.9643661533545087
1983	5.318558295835891
1984	5.855815129739969
1985	3.5051550113633456
1986	1.5375966956937706
1987	0.31219367710007423
1988	0.4846520988543405
1989	0.10752432831327094
1990	1.3929848433714724
1991	6.2306451343578795
1992	7.737775563266258
1993	11.429352749704394
1994	24.151184890293376
1995	34.26734467060326
1996	31.49324142426151
1997	29.94016348806689
1998	24.04807228915663
1999	19.91011633399999
2000	18.900157261983423
2001	16.519051213852517
2002	16.526817141273842
2003	15.223900898157448
2004	15.962867908150324
2005	16.989165007142752
2006	22.401342213182126
2007	24.75972898368664
2008	22.26759244705054
2009	19.036378332778142
2010	21.045177970977715
2011	19.986751839168072
2012	20.357702357193723
2013	19.259651092450977
2014	18.34519552153004
2015	16.521455470619408
2016	15.025916223421257
2017	17.005500160066152
2018	14.857159859750583
2019	15.47492663993928
2020	14.25940635320962