Year	% of total merchandise exports
1970	1.0294742704715003
1971	1.8887606792778302
1972	0.4016600881353939
1973	2.2209749634151654
1974	2.2312637295623947
1975	1.9825982996811904
1976	0.02734770131038323
1977	1.3121646216562906
1978	2.1761952466261234
1979	2.0534970068955065
1980	4.519705779772099
1981	7.511920461051262
1982	3.7851329694485694
1983	1.1381445831042911
1985	3.077392048998636
1986	1.1470636236353173
1988	0.5290359621260459
1989	2.6094234048908085
1990	4.689201404020045
1991	3.556655621475195
1992	3.1994995494199303
1993	3.2969980346988663
1994	3.538288346521873
1995	3.9263562399543837
1996	4.236352159186181
1997	4.85434383754351
1998	0.6247966537319325
1999	1.9396153095581352
2000	1.6022344211949535
2001	1.631314531149526
2002	2.155360713145236
2003	0.28321456625251257
2004	0.02717064461943718
2005	0.03063443806837869
2006	0.009236544241885225
2007	0.00928504827478628
2008	0.25513947554123173
2009	0.03990322625761636
2010	0.06514906142154005
2011	0.018857332139010276
2012	0.6978855611162483
2013	0.16574194668026454
2014	0.01884966905582979
2015	0.006730406403451433
2016	1.8780879748174222
2017	3.099691775640099
2018	2.1947971549442533
2019	1.447550749273109
2020	0.01342392934733555