Year	% of merchandise exports
1999	1.2657968655555678
2000	3.1256506565675815
2001	1.4859941922955244
2002	0.40173477698245946
2003	1.4985566717144179
2004	0.5001935910799812
2005	0.847512024990472
2006	0.00027831936438323817
2016	4.168534973903773
2017	2.505254446235046
2018	3.221020768234628