Year	% of revenue
2003	5.838477028476372
2004	4.361873990306947
2005	4.436532252664361
2006	4.0275535618340745
2007	4.1711560505924075
2008	7.168660652404414
2009	12.787967547688902
2010	7.079121937024905
2011	6.93661624223202
2012	7.0157300258243795
2013	6.700311141118844
2014	7.841853902788457
2015	5.606791172823934
2016	7.510091774646685