Year	% of total exports
2008	14.900645059514025
2009	16.222191863899084
2010	11.646744327744173
2011	12.408291058527354
2012	14.785279377990157
2013	14.979708398442208
2014	12.977770079458779
2015	13.888829214585977
2016	13.225560485884158