Year	% of total merchandise exports
1963	29.64824120603015
1964	24.644549763033176
1965	25.60386473429952
1966	21.84873949579832
1967	11.600000000000001
1969	15.21703432043352
1970	17.727261758247064
1971	20.759627592044012
1972	9.882012182135707
1973	9.275309057871151
1974	4.98575633393589
1975	2.9229453884792136
1976	0.47564402307972803
1977	0.7608072263244677
1978	0.33016442497651344
1979	0.1550666221663115
1980	0.12750232580550708
1981	0.3471359499187493
1982	1.3139186794999251
1983	0.19625225769604354
1984	0.20813990885535186
1985	0.13389198864895924
1986	0.215695326471946
1987	0.21840710424998155
1988	0.07732600644316438
1989	0.08234209124139642
1990	0.1950557760650977
1991	0.06267125156581194
1992	0.03950183139124207
1993	0.019054386890957446
1994	0.055088867794613944
1995	0.07061803847572115
1996	0.056963459818901795
1997	0.054591507056802116
1998	0.1575061966967566
1999	0.0688220648030538
2000	0.03760472658455492
2001	0.028192004232447037
2002	0.008402130116054122
2003	0.012079132552835901
2004	0.05106503156572349
2005	0.013355475123783052
2006	0.02125720608884902
2007	0.11780995910469323
2008	0.11056248316747039
2009	0.08185106947618488
2010	0.17899834601575845
2011	0.14453198076740303
2012	0.10569619143023842
2013	0.011110508282960839
2014	0.05525288117336431
2015	0.004486160791575986
2016	0.0067217329214295084
2017	0.006916362279982343
2018	0.016872333596315278
2019	0.009956308951620295
2020	0.008818742296110784