Year	% of merchandise exports
1970	1.4980272365653415
1971	3.385201003495376
1972	0.6963719049345409
1973	0.5616973821215
1974	0.33747752974860895
1975	0.17726935026140972
1980	0.27474768066130717
1981	0.5038615076915602
1982	1.04647049900219
1983	0.6130075252574744
1984	0.4137023692964906
1990	12.617416741978154
1991	12.5808718967345
1994	8.323460732804506
2000	7.878806896153505
2006	8.139917068854999
2007	8.17749458392083
2009	16.533347413557568
2010	10.780748463438513
2011	8.21973806393212