Year	% of total merchandise exports
1973	4.34390229228085
1974	2.181871005229518
1975	7.169217598537697
1976	7.078083040694072
1977	7.280275101459154
1978	6.7212861637040895
1979	6.000357841888103
1980	7.658242534052816
1981	13.126721079659628
1982	18.46445707128846
1983	10.598834587770108
1984	9.233369808424113
1985	9.67805408751434
1986	7.539512620452157
1987	6.450449492798649
1988	8.728594377870538
1989	6.866437918522282
1990	6.380996668713751
1991	19.503808994486928
1992	2.6535896336955864
1993	2.5573662168542977
1994	1.9497355714414122
1995	2.405089635506377
1996	1.702657101939797
1997	2.07858505510891
1998	2.858912526097402
1999	3.1536505489081517
2000	4.542272204972572
2001	5.575289140371846
2002	5.575540577095233
2003	5.575087630904927
2004	5.575108849355372
2005	5.586876014246751
2006	5.575318118384874
2007	5.575382468348453
2008	5.575952039324193
2009	5.57538249996007
2010	5.575267904757645
2011	5.5757188031389076
2012	5.586927747123906
2013	5.58692776101268
2014	5.586927756623258
2015	4.76272951760904
2016	4.598181799999741
2017	5.068474556690653
2018	3.7926117669050274
2019	4.7298835297716435
2020	5.500261182197181