Year	% of total merchandise exports
1960	1.8726591760299627
1961	2.4489795918367347
1962	2.086956521739131
1963	2.2838499184339316
1964	1.9230769230769231
1965	3.5036496350364965
1966	3.324808184143223
1967	3.2926829268292686
1968	3.416856492027335
1969	4.067618083810075
1970	4.931373284332109
1971	5.873701149823071
1972	5.732736391291024
1973	6.300018611576401
1974	13.256183946361604
1975	21.584499547703935
1976	32.76459137054835
1977	22.335228322465163
1978	26.381695615920325
1979	27.075121942602514
1980	31.02854516133894
1981	32.081863316926054
1982	30.247597624915233
1983	27.972949078866073
1984	33.41250809940392
1985	30.19371319690849
1986	23.07378223059156
1987	23.54758596471087
1988	21.84319086215367
1989	17.582346946983936
1990	17.928556894354458
1991	24.96198047236115
1992	24.309649052154228
1993	22.406994301945886
1994	17.823581907004613
1995	12.699736491544037
1996	10.498761226233615
1997	12.467650092684567
1998	14.854069922317201
1999	14.045405035717412
2000	11.179630428943678
2001	10.343787657220028
2002	12.50852599158791
2003	9.83703027256321
2004	6.085025000004009
2005	4.6911607548808565
2006	5.231658270520958
2007	5.695236686062232
2008	6.832752016576103
2009	8.473438913741195
2010	6.921412410432494
2011	5.197530527499106
2012	7.897409930538919
2013	7.051245434967666
2014	3.994273931604357
2015	5.787405722482218
2016	9.096251861024022
2017	14.22971995883479
2018	17.45216085676261
2019	13.63828454080091
2020	11.065933523167335