Year	% of total merchandise exports
1981	9.018589201498619
1982	8.380375269565041
1983	6.7489967413122285
1984	19.075471049413295
1985	30.773942859381105
1986	35.3693795197335
1987	38.12086086849688
1988	39.893273679636316
1989	39.911675370751325
1990	15.666878244119756
1991	13.708778952441925
1992	11.737992450701737
1993	1.5551915977257353
1994	2.2439012918881884
1995	5.063230520444516
1996	7.5851131233361375
1997	5.753448348207652
1998	7.549614457831326
1999	11.004373176287064
2000	11.64227566563762
2001	8.84315198673832
2002	7.358524178464378
2003	8.10173508163496
2004	7.686063564613985
2005	7.845518700714045
2006	1.317847902010321
2007	0.2525118791112588
2008	1.4374319297858829
2009	1.5979331583128877
2010	2.3366428218814423
2011	1.917348915240924
2012	1.496737089161642
2013	1.2885218601579964
2014	1.9267282573568842
2015	2.874654337521466
2016	4.401305615676013
2017	4.9312565807326605
2018	3.737151290338244
2019	2.6613262410230654
2020	2.3559771770214293