Year	% of merchandise exports
1971	0
1972	0
1973	1.7136460391509858E-05
1974	2.105264880096383E-06
1975	0
1976	0
1981	0.01737707855159314
1982	0.06699740007251774
1983	0.04995349932022593
1984	0.04870968311889272
1985	0.6156487259009048
1986	0.33298025894812516
1987	0.3623911229373103
1998	15.800175272162939
2000	28.75286941505693
2001	31.092162822637125
2002	22.63389598858693
2003	20.321498374595727
2004	19.950727553995325
2011	3.8025071138615156
2012	2.924386200970626
2019	42.058064889627666
2020	42.41668483459602
2021	45.47664211020886