Year	% of revenue
1994	32.83590384097121
1995	33.18117476654999
1996	33.21097290042996
1997	35.1910890313214
1998	37.30983282342101
1999	38.622522422766025
2000	35.57951488633445
2001	35.346658471066014
2002	36.07239218323032
2003	35.866138400140244
2004	37.534643760439636
2005	37.61760651214941
2006	36.11535324396437
2007	36.94705162534273
2008	36.729821221823805
2009	35.42600850951984
2010	37.34563813027484
2011	36.237808654522446
2012	35.52632806224253
2013	35.64655350493833
2014	34.064096083854594
2015	35.77887297485799
2016	35.47809603075257
2017	35.09532825057592
2018	34.1673701372738
2019	33.61037328507168
2020	35.71724942521441
2021	35.06466742585626
2022	35.60391260599187