Year	% of total merchandise exports
1960	1.1114051336332362
1961	1.870899813719932
1962	0.6582672108567613
1963	0.47804799155061345
1964	0.6277968672936323
1965	0.5737329045523596
1966	0.5752118892775808
1967	0.739640374855577
1968	0.734709865712491
1969	0.6730083163019285
1970	0.8819947848975089
1971	0.9854269458848773
1972	0.8979834094367841
1973	0.6171945823999289
1974	1.3910099924846113
1975	1.2956657700890182
1976	1.1744817648255226
1977	1.2462687133746726
1978	1.883882393983379
1979	2.0314616864234307
1980	2.216760112776757
1981	4.014632043704296
1982	5.050470972059544
1983	4.975360228487577
1984	4.4257738153606025
1985	3.81029620176548
1986	4.277114368080918
1987	4.2989971770771005
1988	3.563979467149841
1989	2.9205972271081944
1990	2.704455138237957
1991	2.767606920842565
1992	2.784306688633249
1993	2.9497083731089035
1994	2.6233364929315313
1995	2.6160877071510598
1996	2.330985264784091
1997	2.3019749766472786
1998	2.493466795025224
1999	2.4254478850218626
2000	2.3160772680544657
2001	2.5555162238336573
2002	2.726845373028477
2003	2.725694124269135
2004	2.7868208439753333
2005	2.9075611069575285
2006	3.090991565193107
2007	3.5264904319657244
2008	4.187599799554937
2009	4.364070937748775
2010	3.906306763095172
2011	3.8584488261607834
2012	4.170752922961327
2013	4.326499099407098
2014	4.5612558279689654
2015	4.728122121659419
2016	4.45570366884303
2017	3.927733147725845
2018	3.770927094476094
2019	4.171670349084368
2020	4.0592653961879765