Year	% of total merchandise exports
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0.47973683008178375
1973	0
1974	0.9580615912343373
1975	3.2241456242920727
1976	1.3043073557815372
1977	0
1978	0
1979	0.4752098843655948
1980	0.41654269562630164
1981	0.24291339353928734
1982	2.246201667661433
1983	1.475244384209464
1984	9.841140529531568
1985	5.843091734662524
1986	2.0043784967161278
1987	2.15540004328692
1988	3.401485223720715
1989	2.3469600145558616
1990	1.4681763140011956
1991	1.6169260191716193
1992	1.73282724920436
1993	2.2095059992891155
1994	1.5925948123399702
1995	0.7933341531233977
1996	2.1241380578582754
1997	1.0631076945231854
1998	1.7502564401751766
1999	1.2749096404309193
2000	0.011011449627764106
2001	0.005430382159380544
2002	0.005809366125951063
2003	0.003244803325752281
2004	0.005097826276068156
2005	0.013277352104655265
2006	0.0025617599704897305
2007	0.005271512009535218
2008	0
2009	0
2010	0
2011	-1.8734183350375068E-16
2012	0
2013	0
2014	1.1385384556990991E-14
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0