Year	% of revenue
1995	25.441378000764132
1996	26.13262167741764
1997	26.19824375533536
1998	25.863803991817306
1999	26.891558811873534
2000	26.743793959074765
2001	25.62386718093726
2002	24.232156481319965
2003	24.586118206949646
2004	25.14467148476293
2005	25.256190745944707
2006	25.353774214791024
2007	25.411022369007075
2008	24.44099984929896
2009	25.118105170169038
2010	25.379083280150766
2011	24.733808953350273
2012	24.968990832523623
2013	24.29718375639813
2014	24.08259532856199
2015	24.84615730666963
2016	26.53096040973223
2017	26.078653152284048
2018	25.9545567185749
2019	26.82077160816284
2020	26.28545467554671
2021	26.99865734592315
2022	25.47349108259654