Year	% of merchandise exports
1970	6.164360131968023
1971	3.789527353787856
1972	3.8965091977248707
1973	29.12211455849971
1974	0.9702478980272508
1975	1.5330753305049347
1980	1.1133675120266011
1981	1.8681114022701266
1982	3.9861423300136605
1983	2.9092395779223215
1984	5.197801752111509
1990	8.19272545855636
1991	10.056848606129298
1994	12.033923547970518
2000	29.564585606088762
2006	7.894726516112584
2007	2.1136125867509774
2009	1.9833140335176982
2010	1.7311394396318676
2011	2.828973437995691