Year	% of revenue
1995	33.01275412067588
1996	33.45030990955563
1997	35.41837642508524
1998	36.18972866932933
1999	39.16282958382
2000	38.1291324908637
2001	38.5892991323039
2002	38.25855303052924
2003	38.26886063856362
2004	38.52398698517993
2005	38.41084248404448
2006	37.47330562358024
2007	37.73707808069371
2008	37.41674701475933
2009	36.97318407565948
2010	38.4011005344275
2011	38.02307299241382
2012	36.790220334810435
2013	37.00689023007034
2014	35.5760246111751
2015	35.31050746093051
2016	36.03111405738441
2017	35.39458978702824
2018	35.61560402308904
2019	33.8933503509659
2020	34.78920640491105
2021	35.00359665136749
2022	35.55648812799252