Year	% of total merchandise exports
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	66.66666666666666
1978	74.4186046511628
1979	73.21428571428571
1980	72.95597484276729
1981	76.19047619047619
1982	82.85714285714286
1983	78.125
1984	81.74603174603175
1985	85.34798534798534
1986	80.22598870056498
1987	75.72815533980582
1988	23.88310015979977
1989	16.359205547228104
1990	-2.0673154848995128E-08
1991	9.098568923512295E-10
1992	4.196531139654417
1993	4.295858289214836
1994	2.489790646160954
1995	2.5633811536502926
1996	17.01794532838162
1997	0.05815755402941658
1998	0.021039337623943465
1999	0.017313028027084947
2000	1.6633714245731128
2001	2.366989321873139
2002	0.2238915483270793
2003	0.8403015193340434
2004	0.8555669182057558
2005	0.9605586327235396
2006	0.685611744720333
2007	0.5938666530709359
2008	0.5351736502532152
2009	0.54667022468592
2010	0.549267242428425
2011	0.2895714613569057
2012	0.43582633443356555
2013	0.8413115357458314
2014	0.6420521440103293
2015	0.5474241608151779
2016	0.6157625030967971
2017	0.4951516236276196
2018	0.36139275120616093
2019	0.27056244866362483
2020	0.30410360992175667