Year	% of total merchandise exports
1981	5.417385418044063
1982	4.556012305357081
1983	3.4108520268927847
1984	4.706104579773793
1985	1.5038014121479393
1986	2.4505675547254753
1987	0.7616358290118183
1988	14.131903023076967
1989	2.8342853519196023
1990	2.3569285199264627
1991	0.5955414911875757
1992	0.2978156616957335
1993	0.7206675623801512
1994	0.8239220591537186
1995	0.16354145359922914
1996	0.05554012774229381
1997	0.02519526329050139
1998	0.022542831379621278
1999	1.4608338639836995
2000	0.034845639277826385
2001	0.05944785663570844
2002	0.16858753742511132
2003	0.2494236676434617
2004	0.4403224238413883
2005	0.28664092066887725
2006	0.3765411056374005
2007	1.197498669970875
2008	2.32587606704704
2009	3.047285249888307
2010	1.7428162335489588
2011	1.9176638451868095
2012	3.6960469415452417
2013	3.422283668747603
2014	4.248015407777414
2015	2.9284093989436277
2016	3.5837061449655025
2017	4.036562575688282
2018	4.802896342675073
2019	5.330214023413038
2020	3.4040796399694875