Year	% of revenue
2002	37.368947697559875
2003	33.821574800625
2004	37.864116272835716
2005	37.29562515593044
2006	34.240160884828796
2007	33.084862899998384
2008	38.65520915522049
2009	36.6734294296654
2010	36.176905974535885
2011	35.02019497942308
2012	36.626289851211695
2013	36.309177805678296
2014	38.57383390175265
2015	41.38673117391802
2016	42.651542006380716
2017	43.111457787517324
2018	44.502054896235485
2019	42.807525056049734
2020	36.39026921857032
2021	40.23815151970713
2022	39.96877415289699