Year	% of revenue
1995	35.72856825830422
1996	35.21865236258972
1997	35.75300853762129
1998	36.84415531099147
1999	35.804343833670025
2000	36.830420137883515
2001	36.83343126282825
2002	37.21594062703183
2003	36.64782867340868
2004	36.8776014940468
2005	37.15123846743831
2006	36.907359037810444
2007	36.56020295703545
2008	36.908003614047004
2009	34.09460413894011
2010	34.71103988317771
2011	35.27628255979028
2012	35.36614635594188
2013	36.10666590801867
2014	36.447547864023115
2015	34.68078381046864
2016	32.357097657445756
2017	33.72936420552553
2018	34.00175878350077
2019	32.514771752992075
2020	32.29728322613334
2021	33.66538308380955
2022	35.036002591308815