Year	% of merchandise exports
1992	18.937267001790364
1996	28.17777144485014
1997	16.032028609696
1998	14.055656310763439
1999	21.61659697240931
2000	16.974542997685628
2001	16.41657189365617
2002	23.13603867117461
2004	20.621075053224892
2005	19.75148686914036
2006	19.035529636305984
2007	18.61051311346434