Year	% of total exports
2003	12.065825887696867
2004	15.554503647016617
2005	12.895932158485365
2006	12.024960604904962
2007	12.008834013182014
2008	10.747723129125108
2009	14.065517662838804
2010	15.467912558585004
2011	9.447718639455987
2012	11.936522676158004
2013	11.628666255514625
2014	11.934915416943095
2015	12.831719806377249
2016	13.211146751696683
2017	12.235205148869628
2018	13.525149812079537