Year	% of revenue
1995	19.684074701954028
1996	18.609787412382726
1997	16.756039912933275
1998	15.938731922622868
1999	14.86839943164793
2000	14.437360494650692
2001	14.002199191259415
2002	12.822118967950649
2003	11.92270007348567
2004	10.704901698059514
2005	9.830404908678341
2006	9.37428224562785
2007	9.033752796400131
2008	8.67051822406119
2009	8.526054705375042
2010	7.849746596713148
2011	7.6986774704713685
2012	7.51780698770443
2013	6.951230787832234
2014	6.826212441944045
2015	6.438307836920826
2016	6.259717286697616
2017	5.386651447004033
2018	4.742136461424088
2019	4.584950915602697
2020	4.5795931616155565
2021	3.8028487616934954
2022	3.3102634338276475