Year	% of total merchandise exports
1964	0.03722721437740693
1965	0.037608123354644606
1966	0.014488554042306579
1967	0.1101098817535455
1968	0.013145786775338505
1969	0.08946210906922131
1970	0.41180919307577113
1971	0.3735018336481427
1972	0.10851120777061547
1973	0.1611279484390565
1974	0.07379538629538629
1975	0.5707983413329718
1976	0.2629942639466002
1977	0.43544162719420454
1978	0.5171200692773604
1979	0.8860448481605974
1980	0.5338981028333167
1981	0.6052898741040066
1982	0.6528296414079919
1983	0.6528296414332749
1984	0.9919215821510177
1985	0.6823959782153706
1986	1.7765471744437722
1987	0.06135014715197841
1988	0.0014031831418020557
1989	0.0010482631261974054
1992	0.04585116612721143
1995	0.00020349297779065015
1996	1.9176770075712894
1997	0.6429408053791805
1998	0.09928412943795079
1999	0.04080663727241231
2000	0.023921592112611266
2001	0.009289145287930307
2002	0.03661861374952435
2003	0.21004821811267008
2004	0.05429550115730105
2005	3.6667319665320193
2006	4.109522582620379
2007	5.027839662444979
2008	7.55785855748401
2009	2.5249979150198003
2010	0.6850149985634865
2011	0.08703373210190374
2012	0.09302967467239223
2013	0.020545763491406306
2014	0.0025428054380540136
2015	0.021310055099910546
2016	0.012464622715670717
2017	0.014328054336661199
2018	0.01468911009576471
2019	0.007124701705548301
2020	0.04200492798405235