Year	% of revenue
1990	32.64411339743909
1991	22.664543524416136
1992	27.474478473146913
1993	30.0610721556209
1994	28.24180642332566
1995	26.728201099764338
1996	29.04242996267536
1997	35.05499760879962
1998	33.125682881883854
1999	31.922021700467372
2000	31.788981091636163
2001	36.9603964400674
2002	42.43672579680081
2003	37.14803597541961
2004	35.5146874180544
2005	34.99460545553668
2006	32.29400918348567
2007	32.558322004538944
2008	34.446284450077876
2009	33.88949886887731
2010	42.413674145255456
2011	38.764025065693744
2012	38.26148963229786
2013	33.11851940306889
2014	35.59266343053941
2015	36.396591721664855
2016	39.73154165157973
2017	37.91509459361395
2018	38.13728763061637
2019	37.27704673053706
2020	37.41726240960088
2021	40.52746164299539
2022	38.38530626838757