Year	% of revenue
2003	5.715411386171121
2004	5.260500807754442
2005	6.42380957836005
2006	6.554022121537074
2007	7.229093536459205
2008	8.232621404652166
2009	7.9847503524547365
2010	8.16612502096179
2011	6.156419907550458
2012	6.688722226722926
2013	7.444038221062571
2014	9.469328015978125
2015	7.203651317830788
2016	8.045973596299566