Year	% of merchandise exports
1975	2.061738715537679
1980	1.4981441168969327
1983	4.319356592696256
2002	27.539436530621067
2003	28.500277341101782
2004	28.14668981710884
2005	19.487765202878144
2006	17.667929693528276
2007	19.299424454638405
2008	17.322977414218517
2009	17.42957114722866
2010	17.460034209741792
2011	16.771257352012093
2012	15.962664905665019
2013	16.90653185261312
2014	16.43694781803796
2015	15.80419781955233
2016	18.20338372071784
2017	16.177222281589028
2018	15.384273846936194