Year	% of total merchandise exports
1960	3.2710280373831773
1961	3.115727002967359
1962	3.3834586466165413
1963	1.2077294685990339
1964	1.4690451206715633
1965	2.0456333595594023
1966	2.3956194387405887
1967	1.4790996784565917
1968	9.02990411908009
1969	4.484655384892834
1970	3.782021591192504
1971	3.520433284096504
1972	2.6974356897721177
1973	3.3582539976340122
1974	2.6963797748391847
1975	3.9203268099555015
1976	5.56317742531552
1977	3.33012160732823
1978	3.0161251424152056
1979	2.0923655122801166
1980	3.4259186498461616
1981	4.781302243851923
1982	6.909291358980423
1983	5.741172315846676
1984	3.9420031021261295
1985	5.741172311392086
1986	5.756226612402889
1987	18.00606520090978
1988	22.491060786650774
1989	25.4524089306698
1990	23.2767109798129
1991	20.68213873573535
1992	15.465331384731265
1993	15.096310048735207
1994	13.747752391395851
1995	13.391247336502213
1996	18.2389460932768
1997	13.718037318590188
1998	19.518559592928437
1999	9.508234707965721
2000	5.166307667592019
2001	2.647527291482613
2002	0.2883832289607413
2003	0.3001051686117807
2004	0.3348524178001832
2005	0.3219739035727468
2006	0.37748700239133065
2007	0.3715257854533454
2008	0.4205464316231409
2009	0.7044832140139334
2010	0.17659001364393234
2011	0.9785853489352527
2012	1.9551827841661782
2013	1.666219040380703
2014	1.4885302382376306
2015	1.5291109304093604
2016	0.3949676447003787
2017	0.012321216783480637
2018	0.008774587280249994
2019	0.0059181291868856956
2020	0.624702322712176