Year	% of total merchandise exports
1968	0.004463887152932774
1972	0.46600877192982454
1973	3.6789449749886316
1974	13.041817273502012
1975	5.52065907010511
1976	2.642346171105773
1977	1.192297418712513
1978	0.011025763534124738
1979	0.00870663009882025
1980	2.6731837793946727
1981	8.273392794348007
1984	2.396895796318493
1985	0.25802075954602544
1986	3.082220308627014
1987	5.8104782000614765
1988	2.013102729549773
1989	26.721306524432425
1990	4.491812796784287
1991	4.998454882769286
1992	8.653914231498499
1993	12.618180533232692
1994	10.121318096715509
1995	11.939055644041101
1996	19.625445490845035
1997	21.21815626187182
1998	16.225291875348447
1999	17.738646968559692
2000	10.204810172997231
2001	4.46455778210543
2002	23.570201318549238
2003	40.645241504534425
2004	46.39584521226063
2005	48.22201342352154
2006	31.157537640637024
2007	32.24278338375431
2008	34.64433489462311
2009	26.41514045265288
2010	18.19960730712003
2011	30.31832728734648
2012	35.09150968816386
2013	34.634639754987326
2014	22.056385667190572
2015	26.55055416831667
2016	22.970182496022268
2017	33.15971895264234
2018	22.958267810750304
2019	20.92885662604682
2020	10.855584082145427