Year	% of total merchandise exports
1960	4.28958195809634
1961	3.966090306488654
1962	3.570258208218715
1963	3.4078116872142723
1964	3.2497229540852413
1965	3.1324212384922614
1966	3.0581512474901555
1967	2.775604918989549
1968	2.7826117077358736
1969	2.8014227580555233
1970	2.5321528030668468
1971	2.600166947617137
1972	2.7036157334320357
1973	2.848433782396233
1974	3.9268455062263308
1975	5.534098976322479
1976	5.874142885910382
1977	6.460580539091241
1978	6.3049457033311525
1979	6.387619108290426
1980	6.622727117113603
1981	7.943606002764896
1982	8.478355857760029
1983	7.618841548085588
1984	6.40845118384617
1985	5.493486989961472
1986	4.4027481306936025
1987	3.7576811536962156
1988	3.5935230717201034
1989	3.481175652724949
1990	3.2646465943505003
1991	3.2740584796661714
1992	3.352169052210235
1993	3.384560808197274
1994	2.970669664148619
1995	2.7592801947557914
1996	2.826677852140117
1997	2.867174302284126
1998	3.0025437018346115
1999	2.6811163230625685
2000	2.6862020659259387
2001	2.9040058431026217
2002	2.9743443088877894
2003	2.9726901300239525
2004	3.04034515448983
2005	3.3313835709755906
2006	3.367592219760935
2007	3.5000982816827326
2008	4.008384651562152
2009	4.072583317857864
2010	3.881622655210182
2011	3.7797903581650174
2012	4.271237124277997
2013	4.530048535268681
2014	4.5649407699621465
2015	4.585718075847921
2016	4.25153939809872
2017	3.923865870508647
2018	3.666541128920526
2019	3.6900762239230263
2020	3.4080766836276375