Year	% of total merchandise exports
1963	1.045635081462268
1964	1.5110509697789807
1965	1.3557660895132309
1966	4.3854628702246385
1967	2.2587412587412588
1968	1.7926837335450154
1969	2.4991095809094146
1970	1.5320778806255984
1971	1.8514622343782876
1972	4.840729648788456
1973	8.024970224649882
1974	6.81437777219851
1975	2.005747725479101
1976	2.7693251244309205
1977	3.7469759765954653
1978	3.3834983625135657
1979	0.6884981589210543
1981	0.442086651331663
1982	0.7178438580844445
1983	0.03633626618910431
1984	0.009729098653060342
1985	0.4363127685321906
1986	0.9933274309529465
1987	0.15194662748925808
1988	0.009834907663628276
1989	0.28662304836310426
1990	1.5550942215369945
1991	0.657801127346358
1992	0.5295726637212202
1993	0.22357475852403702
1994	0.15368942133657282
1995	0.5785852753183244
1996	0.34053700065487885
1997	0.4448779491948815
1998	12.475863483864739
1999	0
2000	0.07156360947521331
2001	0.2184878884862725
2002	0.4384957345982685
2003	0.45442637253477974
2004	0.3318777600953484
2005	0.28109723544547405
2006	0.3813670348515806
2007	0.1313751497745638
2008	0
2009	0
2010	0
2011	0.11400531153186909
2012	0.013544633863274482
2013	0.007810380907048576
2014	0.04864916143619767
2015	0.001841472653650028
2016	0.03212287141876634
2017	0.007923059746710929
2018	0.01775534821906002
2019	0.00443389174508037
2020	0.15974838344522962