Year	% of revenue
2003	9.11769212248561
2004	9.91013731825525
2005	9.466954734878382
2006	8.130058235533683
2007	8.569628437193053
2008	8.38877349186412
2009	7.327775565280516
2010	8.392795844071834
2011	7.737440751574801
2012	8.363241306954158
2013	8.429354062013418
2014	9.400903068861698
2015	9.150217724653828
2016	8.573941904366265