Year	% of revenue
1994	18.338353424104344
1995	19.057736926895597
1996	18.480673957991954
1997	19.265667526728603
1998	19.303793800869194
1999	18.5172246468464
2000	18.82291277134432
2001	18.563637355293597
2002	19.89275629579418
2003	20.064750473783953
2004	19.492650961072606
2005	17.956838937753716
2006	19.839161829277156
2007	17.35108540622663
2008	21.21045964453706
2009	21.789496110783325
2010	24.18425449841717
2011	20.491290700671524
2012	22.02653430663783
2013	24.06840005120714
2014	23.720394185257764
2015	22.262043436889556
2016	23.677525370224256
2017	22.327059584065413
2018	22.24373781779811
2019	24.008750617803045
2020	23.935826942456327
2021	24.299623690568474
2022	20.872991845406432