Year	% of total merchandise exports
1960	0.07087172218284904
1961	0.09269162210338681
1962	0.2554594149155336
1963	0.10661738574170163
1964	0.37738486267384164
1965	0.4826678367705134
1966	0.6433084434233199
1967	0.8823884926870542
1968	1.3073979591836735
1969	0.6990071069329385
1970	0.26037387204797013
1971	0.44066979051819183
1972	0.5410211962413264
1973	0.6331870684648642
1974	0.7069813782111358
1975	0.8082650352072029
1976	0.7946615854805901
1977	0.6932887343670188
1978	0.5546635296870689
1979	0.1744791871724004
1980	0.19356370859321514
1981	0.03365284242195863
1982	0.21650807095077593
1983	0.46441087823446986
1984	0.8787465965278938
1985	0.5385277251874335
1986	0.6080948667275863
1987	1.046536202835677
1988	0.7874577772117632
1989	0.7060728080804924
1990	0.553501679129465
1991	0.4777330900632929
1992	0.7343655303171002
1993	1.2517555312535187
1994	0.8299816068356508
1995	1.8613550761523971
1996	1.7458663606453748
1997	2.2171736413024172
1998	2.1987343080125736
1999	2.1403494597358814
2000	1.3731468539240097
2001	2.3721609743588297
2002	2.697330552364248
2003	2.8924691852663496
2004	2.7117305289356812
2005	3.4922918181127547
2006	3.5498927546078787
2007	3.291503521238865
2008	3.4113684326721967
2009	2.714816569709527
2010	2.996517362751653
2011	2.706665321163265
2012	2.464450790871321
2013	2.258866125615458
2014	2.747689993336295
2015	2.29897956983059
2016	2.3837268587652662
2017	2.411245704222765
2018	2.1201035970837134
2019	2.040333400540054
2020	2.3976568940788883