Year	% of revenue
1993	7.019235016408095
1994	7.345863530827295
1995	8.928678791522621
1996	7.2896876957401755
1997	6.551428488855636
1998	7.170064236281074
1999	6.757219236149078
2000	6.327563706111373
2001	8.267900255182866
2002	6.910665398589795
2003	14.96980845967262
2004	8.24721863204793
2005	7.795487795487796
2006	8.125777857707178
2007	8.185829132056273
2008	9.045307468918327
2009	10.46824731588639
2010	10.630709807255695
2011	10.4067060907745
2012	9.438869056973724
2013	9.297907539710321
2014	9.374002700380508
2015	10.792873842775244
2016	8.78007788270237
2017	7.816082925222887
2018	7.9514422784690435
2019	7.60295358181748
2020	7.754849450647439
2021	8.352617350749732
2022	10.174342878274222