Year	% of total merchandise exports
1964	2.2661531878476677
1965	1.8992102294095414
1966	2.6514053897421035
1967	1.2915098285236304
1968	0.8676219271723413
1969	0.3986655235397064
1970	1.49328287455205
1971	5.511397179523796
1972	2.974367358562958
1973	3.305454942254418
1974	5.481831263081264
1975	6.7882118805414695
1976	5.202208576966301
1977	5.8924491501811085
1978	6.3909348999463695
1979	6.07706532990614
1980	6.0514867156759715
1981	5.291717158685472
1982	5.840722922489913
1983	5.840722913114326
1984	8.629782817664692
1985	4.708932767161736
1986	8.367107416662767
1987	9.003896165621287
1988	4.7220585985118
1989	7.856601094925692
1990	5.784702541294356
1991	12.981678579329989
1992	6.0441369316295255
1993	7.397394365340411
1994	6.448500835962692
1995	7.606893926276499
1996	7.243118470250722
1997	0.007207873191451259
1998	4.6781375139526515
1999	20.173330569729963
2000	6.609525443995934
2001	0.061393874904177734
2002	6.8102137777738605E-15
2003	0.002824055694768462
2004	0.007460264415208495
2005	1.0061376572889871E-05
2006	0.030188156027792967
2007	0.004695071611518928
2008	0.010360034204489674
2009	0.07403902826264042
2010	0.005604888860970353
2011	0.006285521321527397
2012	0.0004238396305946696
2013	0.14500723174954536
2014	10.412449426868637
2015	1.4736804141613429
2016	0.030314982556396405
2017	2.670146531175689
2018	3.591863130340918
2019	0.05398017444366231
2020	0.006548338350213512