Year	% of total merchandise exports
1970	60
1971	46.15384615384615
1972	20
1973	10
1974	34.61538461538461
1975	60
1976	64.70588235294117
1977	19.791666666666664
1978	17.829457364341085
1979	18.452380952380953
1980	16.352201257861633
1981	16.071428571428573
1982	9.285714285714286
1983	9.895833333333332
1984	5.158730158730158
1985	4.029304029304029
1986	3.954802259887006
1987	2.912621359223301
1988	0.7557354999644981
1989	0.26654329710982355
1990	2.7472527478851387
1991	1.8348623850261623
1992	1.5064470735716393
1993	0.37904632071104927
1996	0.7226303743635007
1997	0.029078776473921156
2000	0.028977956772199078
2001	0.022330081772414138
2002	0.006396851302085603
2003	0.17403442860920176
2004	0.37480932895780794
2005	0.7263006232843382
2006	0.7432310630013993
2007	0.3852917881912593
2008	0.46206462114789193
2009	0.2405079271428918
2010	0.8770720949154265
2011	0.6550171740051655
2012	0.9516108642512143
2013	0.6082990348255349
2014	0.7102966783897328
2015	1.3614220050346042
2016	1.4827340954911992
2017	0.8161051753905798
2018	0.7616256898007877
2019	0.6047410207500776
2020	0.5889009441269234