Year	% of total merchandise exports
1961	29.28571428571429
1962	37.62376237623762
1963	15.777875716174528
1964	29.268292682926823
1965	3.870967741935484
1966	0.7692307692307693
1967	1.8292682926829156
1968	13.992094861660078
1969	3.7897169266320043
1970	8.06356182909306
1971	17.29666860513417
1972	16.66506924809508
1973	28.100912342444005
1974	3.537143124736587
1975	8.489791449997263
1976	3.5865952186616514
1977	3.0129861791097485
1978	1.7555584841011354
1979	0.09131818267402232
1980	0.10055389859394973
1981	0.014118710114643926
1982	0.11638232023242621
1983	24.461501128118506
1984	14.648170247160516
1985	21.620268660191357
1986	20.40318833680611
1987	17.079889807162534
1988	26.35670048701811
1989	26.527056667465786
1990	24.83094858766128
1991	30.235177068138757
1992	17.010923634223225
1993	3.673601878868039
1994	16.41407998719344
1995	8.605084674314828
1996	5.450121619829573
1997	1.6221730267615202
1998	1.6041623593758054
1999	1.8542298774700858
2000	0.014317625055157657
2001	0.0300949940003438
2002	0.2670365613529759
2003	0.5330886505712088
2004	0.03775255660201601
2005	0.020805371534111917
2006	0.0084051527645261
2007	0.022325840470986163
2008	0.002588295409981419
2009	0.002241846694578253
2010	0.0015538310381898615
2011	0.001101348137427848
2012	0.0021364069405429846
2013	0.0010387914361535294
2014	0.0008963322560772206
2015	0.0006201381810148061
2016	0.00033490068046358387
2017	2.6723407132126814E-05
2018	9.60932906075714E-06
2019	5.240085357046316E-06
2020	2.4677210562056573E-06