Year	% of total merchandise exports
1960	2.552076148434267
1961	2.7852018568012378
1962	2.670663578144161
1963	2.282608695652174
1964	2.452059100911663
1965	3.4862774186711882
1966	4.1919030921262355
1967	5.204568454532311
1968	4.506937624335826
1969	5.627182663191991
1970	4.590660524587146
1971	4.9316168638700875
1972	5.977429176943263
1973	6.974981340209184
1974	8.043161676375258
1975	9.55303257426646
1976	9.0873458385432
1977	10.910088953120306
1978	10.648825484295699
1979	9.557317485121704
1980	11.250762065248715
1981	12.97454282150067
1982	13.408284993953307
1983	12.43606316376448
1984	10.309936681155033
1985	7.662020654293348
1986	5.179138799139336
1987	4.469427656784964
1988	4.306071878817093
1989	3.6072451169880537
1990	3.72701683742742
1991	3.661767581120238
1992	3.5420161678436646
1993	3.669752957694509
1994	3.1910897230040915
1995	3.357066218111246
1996	2.8333835778228735
1997	2.8744586689582996
1998	3.0056720553717393
1999	3.009387696047225
2000	2.873434664892414
2001	2.9616141229228474
2002	3.12656743498394
2003	3.2336262047730004
2004	3.5066688933189476
2005	3.4281783760763664
2006	3.182658707289453
2007	3.5177095568473766
2008	4.346571366360891
2009	4.815375200038688
2010	4.47643358104495
2011	4.460571650771174
2012	5.439524730862559
2013	5.427323173338118
2014	5.5034855404535135
2015	5.183075945627106
2016	5.440189025832727
2017	5.3171863449868715
2018	5.540044175698045
2019	5.115687039620618
2020	4.712331030731398