Year	% of total merchandise exports
1981	1.6606164870435178
1982	0.7813968050244212
1983	0.016718836838898993
1984	0.29814877394962175
1985	0.3346768785760113
1986	0.12711542940956025
1987	0.3768610438832455
1988	0.29564893793441954
1989	0.2423846211740048
1990	0.14390284317594554
1991	0.23469783217990908
1993	13.512172873901907
1994	6.307611862562081
1995	10.912462986730958
1996	6.238296092062404
1997	3.581624549475748
1998	2.5858410491263752
1999	2.0810803682633345
2000	1.7509286631317704
2001	3.375899702745575
2002	2.540308357222524
2003	2.1046301662366664
2004	3.5701938363106382
2005	4.220003336606783
2006	4.56261440158376
2007	6.936662739874692
2008	17.20362803105326
2009	13.342575542661955
2010	16.341989249831943
2011	20.974945142699532
2012	16.564407708237784
2013	19.290284490338138
2014	20.320942614676508
2015	21.980625190707357
2016	16.085537239249074
2017	17.006502869909532
2018	18.16264625390584
2019	19.16913855825359
2020	20.45975756243605