Year	% of revenue
1993	34.944695755201096
1994	38.75431224913755
1995	42.36941981061175
1996	44.429202234220426
1997	45.711001146387595
1998	46.162917667613016
1999	45.66789028607133
2000	46.61791590493601
2001	45.042600065330745
2002	46.89916313997518
2003	42.42704340392626
2004	44.80481437424417
2005	46.398225148225144
2006	46.94346098476003
2007	46.41840292172222
2008	47.308176378718706
2009	45.69300047220139
2010	45.97897421690661
2011	44.87844149188991
2012	44.878576293003455
2013	44.66103911894857
2014	45.34920829753283
2015	43.90955976060483
2016	45.19120640975156
2017	45.845491046746645
2018	46.87675177231519
2019	47.21684760762302
2020	48.44933446031991
2021	50.71521841313063
2022	49.23685711006709