Year	% of revenue
1994	38.87829436668065
1995	39.859480376667754
1996	40.78899519023372
1997	38.34934437433347
1998	40.79647817465683
1999	40.319420419843254
2000	40.15064357795198
2001	40.671740410450774
2002	38.46207265296711
2003	41.52439541168072
2004	40.03481015324218
2005	42.397131772529136
2006	41.70762718434559
2007	42.45997689983735
2008	38.63738073116889
2009	37.06005324380544
2010	38.455079451703234
2011	39.18274148250785
2012	39.94857630155164
2013	41.63092682450964
2014	42.541133858214316
2015	43.41393485816941
2016	44.97659688178358
2017	44.56033655645872
2018	44.2708598343149
2019	44.51272572291657
2020	42.88750136111694
2021	42.96936064885973
2022	45.12705201886686