Year	% of total merchandise exports
1960	0.5509641873278237
1961	0.425531914893617
1962	0.4291845493562232
1963	0.2812939521800281
1964	7.797681770284511
1965	8.647990255785627
1966	7.263922518159806
1967	6.876790830945559
1968	4.616998950682056
1969	5.834060969591132
1970	6.273134619131112
1971	6.2919142340480505
1972	6.580722403966139
1973	3.3748839175833822
1974	3.0538107703558905
1975	5.420198007792945
1976	5.675673032729976
1977	6.246730987422851
1978	3.2766754992567697
1979	14.262024121885894
1980	30.18888559775798
1981	30.188885588118612
1982	9.847701900035206
1983	25.034488758528976
1984	57.9028209135998
1985	49.51670900226588
1986	32.26765038968212
1987	39.732823622151734
1988	19.217252907220306
1989	28.28828831720047
1990	16.532617104821405
1991	32.08427191442904
1992	41.753548051568195
1993	28.54685646500593
1994	50.625032463597485
1995	70.39261081367869
1996	81.37023865632632
1997	73.49418604651163
1998	51.541043637473294
1999	33.099041533546334
2000	2.949949919631328
2001	14.654818364639228
2002	13.020145357673252
2003	0.8842485460230898
2004	1.8602839489559844
2005	0.6888135570780201
2006	0.024985693728544714
2007	0.2584516547446264
2008	4.609272588312496
2009	0.22692629421111055
2010	15.134597414582245
2011	0.06713958446406615
2012	0.02957609873311701
2013	0.5085519031307985
2014	0.09427079988711028
2015	0.07619570108785223
2016	0.010131043408798935
2017	0.022279189733422813
2018	0.01934988668404776
2019	0.010371881897657387
2020	0.013728104985706854