Year	% of total merchandise exports
1964	0.0859106529209622
1965	0.11668611435239205
1966	0.04014452027298274
1967	0.09392611145898559
1968	0.19784568036931194
1969	0.09637006103437198
1970	0.17814726840855108
1971	0.1676602086438152
1972	0.2271889966842687
1973	0.6320289989776001
1974	1.3209152375408588
1975	2.4626278520849727
1976	7.422482629886964
1977	11.508643425125149
1978	9.986183238839393
1979	9.032202285151833
1980	10.795158062536913
1981	11.595872217390282
1982	9.583957557348434
1983	11.145862718884024
1984	6.928737187834296
1985	6.417396529013472
1986	5.140377597057387
1987	4.432585516374128
1988	4.267565448303583
1989	3.2744738504810056
1990	2.987134852211446
1991	3.830494100189007
1992	3.845778860712697
1993	3.7209844318075884
1994	3.30419683905211
1995	3.15113862177657
1996	3.2932701036318344
1997	2.9034138218151537
1998	4.149388388024421
1999	3.557025528425909
2000	3.2040975978487505
2001	3.8256869828939317
2002	3.5251758206263624
2003	3.1778373110137252
2004	3.1237167238763326
2005	3.1985308348842363
2006	3.356267892783226
2007	4.114519967511914
2008	5.011204709112377
2009	5.262294372384938
2010	4.875740189843563
2011	4.510303351068139
2012	5.279148185700987
2013	4.718989440382251
2014	5.144630573197245
2015	4.852596864968097
2016	4.328028989607891
2017	3.4667207566909717
2018	3.0099769844545556
2019	2.949793587196509
2020	2.566282061535521