Year	% of revenue
2002	34.665810155923005
2003	34.18845365315807
2004	37.0027592333264
2005	36.29087873398425
2006	33.776062922015285
2007	33.96472602993617
2008	32.40227229552098
2009	37.56303636202778
2010	39.9949220884533
2011	38.68350994015366
2012	40.491838038931476
2014	37.033632062847275