Year	% of total exports
1997	2.37257629059969
1998	4.3630017452007
1999	6.0323241520601
2000	7.68375058774958
2001	7.58419643068756
2002	5.79463977712367
2003	7.03146661211953
2004	4.43094611295252
2005	15.8079280208054
2006	11.1279932858071
2007	11.4594036648549
2008	9.6241531777147
2009	9.67256302794742
2010	6.10850695773118
2011	5.89233290118286
2012	4.92822372001634
2013	4.75804900492288
2014	5.79892481420948
2015	8.02581361952027
2016	9.20494843965237
2017	7.19124192591244