Year	% of total merchandise exports
1960	17.66576049394093
1961	15.364701607775459
1968	62.58741520818498
1969	60.605748495284686
1970	58.84864248020344
1971	58.4215367965368
1972	59.21681231793592
1973	58.51830636307223
1974	57.16630099808499
1975	64.11181743153573
1976	54.27812913544364
1977	55.82451689100457
1978	54.56769444383224
1979	51.70957305433465
1980	51.495451791767444
1981	54.49210071869947
1982	55.16021076292357
1983	53.742032086544725
1984	52.33188631528803
1985	53.039795474019854
1986	53.157431511636034
1987	51.097622872332074
1988	45.23985989442806
1989	44.57738153149624
1990	34.5034217860544
1991	20.745918408279515
1992	23.16275167785235
1993	24.47166102562313
1994	5.243870187766821
1995	5.941810378341394
1996	5.4964986159017135
1997	0.8580079309149662
1998	0.6539880850050195
1999	0.4950019304604444
2000	0.6452016362515237
2001	0.6568442525595063
2002	0.664547500422285
2003	0.7499666745432503
2004	0.9343094268412113
2005	0.385244225502527
2006	0.042875347400110175
2007	0.016211015578821403
2008	0.013664119702123747
2009	0.018083117630374273
2010	0.06787273634871543
2011	0.016965245151293877
2012	0.07707342522345129
2013	0.020827903407344996
2014	0.014325764314512485
2015	0.009737898282627016
2016	0.005864787723584415
2017	0.006101680052018347
2018	0.11352480994996304
2019	0.004285745211919514
2020	0.0029294553282742226