Year	% of total exports
1997	9.245662710466004
1998	8.963779912847114
1999	9.47476173422489
2000	8.469593665517408
2001	8.457079655698683
2002	8.332043787626368
2003	7.307097426435548
2004	7.1315244877402995
2005	7.71207380220385
2006	7.240149324871473
2007	7.445242539632014
2008	6.778822155970429
2012	6.528277600184407