Year	% of total merchandise exports
1960	6.474820143884892
1963	1.3636363636363635
1964	0.34602076124567477
1965	0.7662835249042145
1966	0.3236245954692557
1967	0.34602076124567477
1968	0.2840909090909091
1969	0.14889313406000673
1970	0.3638698630136986
1971	0.20216922110209545
1972	0.953363183579011
1973	0.09850905218317359
1974	0.055728704410823754
1975	0.4875257010831549
1978	0.00836703388648724
1986	1.4590930950604115
1989	5.865997278208644
1990	59.10032861498329
1992	0.03757600065908216
1993	0.016123190311746406
1994	0.0018895836113671843
1995	0.01628886041097338
1997	0.026116095499683988
1998	3.5934246308482396
1999	0.18990527206414567
2000	0.06773357253184238
2001	0.23120253620455092
2002	0.3814676170271908
2003	0.1028398551394839
2004	0.018630055279618245
2005	0.17410419360117357
2006	0.24751993589144472
2007	0.22696344585851036
2008	0.15553995779114177
2009	0.5082159714096885
2010	0.09354288610757286
2011	2.8803526256050573
2012	0.19482474308535933
2013	0.21981935494880966
2015	0.004098913659247809
2016	0.03828655769142093
2017	0.02062993966050701
2018	3.905063554057758
2019	2.8914619341465624
2020	5.160985822451962