Year	% of revenue
1995	34.97144431503435
1996	38.16852545965469
1997	36.55233707215034
1998	37.647494645728294
1999	35.81183678930154
2000	36.980616570037775
2001	39.380951535719
2002	41.652054917122975
2003	39.52291914430312
2004	39.001224619414636
2005	36.01066497245823
2006	34.82984385387611
2007	35.5074837981839
2008	36.23194589818082
2009	36.142180903578975
2010	36.79251320264173
2011	34.73537012515527
2012	35.71020950096116
2013	36.055669582345146
2014	35.70627775648164
2015	33.920165096639934
2016	37.69454933260808
2017	40.6488476042418
2018	40.65923102984342
2019	40.75060408261039
2020	41.596055508559985
2021	40.89570286954665
2022	39.026245940789636