Year	% of total merchandise exports
1964	5.263157894736842
1966	27.061855670103093
1967	15.473887814313347
1968	17.464114832535884
1969	28.865178334533603
1970	31.857988165680474
1971	0.8227540756156781
1972	0.6929145487440155
1973	3.194798135864478
1974	14.945807187678268
1975	17.554975773387998
1976	16.375346093655953
1977	11.089832528872648
1978	7.925850321370445
1979	8.366883075032547
1980	13.039718390102959
1981	10.779349651717544
1982	11.574777080969543
1983	11.531449318567747
1984	7.20486423511765
1985	3.42840312640121
1986	5.883781158951116
1987	16.66411468916246
1988	7.135291424429154
1989	7.168202151079573
1990	9.851109278811986
1991	10.33762017736265
1992	12.942577710633381
1993	19.49127193266245
1994	20.882340782303327
1995	1.7499940621808423
1996	1.85049487272145
1997	0.16806238662032671
1998	0.579862195204259
1999	0.2260717066161376
2000	0.3921129843863148
2001	6.599580088531408E-15
2002	0.1065072843435855
2003	0.01265928352864813
2004	0.11691384323391091
2005	0.037734371453529474
2006	1.9454459163543585E-06
2007	0
2008	0.0014347180576953181
2009	0.0004231412019096473
2010	0.007827864717186946
2011	0
2012	0.00025159534372083263
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0