Year	% of total merchandise exports
1960	0.1557632398753894
1966	0.06844626967830253
1967	0.45016077170418006
1969	0.0679311070365806
1970	0.09263547938860583
1971	0.08455890223278316
1972	0.06630964071310703
1973	0.2881032665116167
1974	0.4925633722476384
1975	0.344184997778382
1977	0.0834002170368001
1978	0.3422954418821259
1979	0.26122087250506715
1980	0.06697575453506859
1981	0.6066139511569044
1982	0.337971657973887
1983	1.285811924699249
1984	0.6580639061110868
1985	1.2858119247764597
1986	0.3039655999906352
1992	1.6666943008126809
1994	1.2552775889913697
1999	0.12779333220125313
2000	0.33609073349903323
2001	0.35807066613696287
2002	0.6412531415714291
2003	0.9400247512876236
2004	1.4218486879144696
2005	1.658364011399234
2006	2.3855433517119886
2007	0.9659821521540881
2008	2.105202733958409
2009	3.3792905733400556
2010	3.5965329445315075
2011	4.670073424281488
2012	4.28706782239709
2013	5.874865288217806
2014	4.006309363956652
2015	2.0661199612605428
2016	1.9846854151125044
2017	2.277594576494543
2018	2.2288124677028285
2019	1.812709986561498
2020	1.8425933546406654