Year	% of total merchandise exports
1964	5.172413793103448
1965	2.857142857142857
1966	3.389830508474576
1967	7.857142857142857
1968	12.244897959183673
1969	16.19718309859155
1970	13.765182186234817
1971	14.798206278026907
1972	13.989637305699482
1973	5.009371787895278
1974	7.0127283980517205
1975	1.294329603641191
1976	2.2666732438831887
1977	4.085841755044886
1978	80.14615261929272
1979	85.23921248597368
1980	78.55730551578374
1981	2.3254533441010206
1982	4.468091360710192
1983	0.7190113593808514
1984	2.415046846594882
1985	3.0167701002510126
1986	2.6306067078450615
1987	0.2991586737605626
1988	1.2512899896800826
1989	2.8383614579286154
1990	1.974974974974975
1991	1.374296178866233
1992	0.3109085419724022
1993	0.8069333229543594
1994	1.4112362484722354
1995	2.546967593522467
1996	0.6001120488257294
1997	4.588433844163575
1998	2.5414567568202338
1999	4.798043631033981
2000	73.18482110571517
2001	63.77644236993238
2002	44.00691187612863
2003	76.06289772056313
2004	75.41270169296861
2005	28.215988953572875
2006	30.184636626791907
2007	35.317026712347186
2008	56.7553148741502
2009	61.74265730177457
2010	37.14646437765023
2011	32.89653015560731
2012	39.303894989976975
2013	51.069528329099946
2014	51.744924447257965
2015	41.94021039300323
2016	38.945657538557235
2017	29.78565325021649
2018	43.80349109159683
2019	46.046323564736475
2020	41.525593739813274