Year	% of total exports
1997	9.345461164905986
1998	9.146490127442258
1999	9.520975204075954
2000	8.421879113763433
2001	8.45162832278918
2002	8.33269910839325
2003	7.327245768276524
2004	7.189174063088824
2005	7.676169369245187
2006	7.269543038056305
2007	7.4717257165619735
2008	6.813616930698654
2012	6.611208700104045
2013	6.980190669091828
2014	7.293426038191833