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	3.8748292430111193
1982	5.059194024270179
1983	4.9960385677643195
1984	4.452737884158018
1985	3.8200744865113574
1986	4.3103383261928645
1987	4.331482345422369
1988	3.5865968398673154
1989	2.8983408117164515
1990	2.659254315731684
1991	2.7734457038491285
1992	2.780657939879617
1993	2.939184995652569
1994	2.6157803918674545
1995	2.604389633540116
1996	2.325517222905065
1997	2.279772631469245
1998	2.4781430090768395
1999	2.409676737216594
2000	2.30541535804294
2001	2.552129462867395
2002	2.718197497633248
2003	2.7243440195332496
2004	2.78532586628047
2005	2.90319170962315
2006	3.089608479746697
2007	3.528300211350858
2008	4.182751847372371
2009	4.3622050834346
2010	3.9054669140817384
2011	3.852643245845539
2012	4.173429743851334
2013	4.329992041087881
2014	4.565072704011051
2015	4.731856623677671
2016	4.4598106171840275
2017	3.9295796805427488
2018	3.771083285847512
2019	4.171962595444166
2020	4.059253246785523