Year	% of total merchandise exports
1973	0.5500381970970206
1974	0.49571170036981665
1975	0.27746947835738067
1979	2.5210531926233877
1981	2.3288232882328823
1988	1.6149381781478678
1990	0.13848101770646037
1995	0.7749109414021235
1996	0.5266655008880355
1997	2.989846263413558
1998	7.448992786690395
1999	1.6421665231195137
2000	0.21577272967160557
2001	0.09920153083959615
2002	0.11303016171700221
2003	0.05234389258909873
2004	0.2680912986593326
2005	0.11605823317822053
2006	0.22072035445703767
2007	0.2664717791208761
2008	0.7105662138341409
2009	3.61700975917309
2010	1.0837426869165958
2011	1.2799039312358143
2012	3.366963979020913
2013	8.856173495206118
2014	4.6265114031033185
2015	6.869568697251342
2016	16.125945177572753
2017	1.6694680365055972
2018	5.224226407477266
2019	0.6396071733549353
2020	36.457553193357086