Year	% of total merchandise exports
1961	33.969465648854964
1962	33.204633204633204
1963	16.103896103896105
1964	15.217391304347828
1965	10.23765996343693
1966	9.158878504672897
1967	9.800664451827243
1971	8.379558855645337
1972	11.705816554809843
1973	20.1377688172043
1974	33.43266680573353
1975	31.83691533206096
1976	37.18542764835912
1977	27.64402187803507
1978	42.49216795784054
1979	56.8926391152875
1980	45.88209499273714
1981	42.25481521813108
1982	4.938628994905049
1983	3.7829525483304045
1984	2.3579902819228966
1985	15.43915384913409
1986	1.960351210451589
1987	0.4421138129102024
1988	2.776649097328052
1989	1.7013875068469364
1990	0.8990527981096424
1991	12.26697006602611
1992	1.3708624077756728
1993	0.4334633311942285
1994	0.8052985121235152
1995	44.022553329895395
1996	10.813525162021602
1997	11.631367588268409
1998	22.86403016177706
1999	5.487394874829647
2000	0.12285010746087308
2001	0.07847337940889221
2002	0.09679547048083172
2003	0.06769286473452994
2004	0.13730345730469115
2005	0.14356084517520276
2006	2.51329649888825
2007	0.827847406708763
2008	0.08439030002991259
2009	1.4603327344400592
2010	0.551112385338047
2011	1.4991100231327337
2012	2.6632097739725706
2013	1.1931551028513063
2014	1.076916183768112
2015	0.1085022753110871
2016	2.0144316977226238
2017	0.019386698623614435
2018	0.00842172781823387
2019	0.014793185843078809
2020	0.027758157014080985