Year	% of revenue
1991	39.4076956333766
1992	33.968955112452235
1993	37.61283239814576
1994	39.41376727072719
1995	31.174370872746742
1996	34.63942662923009
1997	35.040607030647934
1998	32.436260623229465
1999	32.022489622195366
2000	34.26664185700331
2001	35.81021087680355
2002	35.27936909456142
2003	33.74086095537851
2004	35.63309246423832
2005	37.10565097398247
2006	37.795341455044614
2007	37.20849420849421
2008	33.37609349607551
2009	34.41383827762743
2010	35.01031260648887
2011	36.17148687754044
2012	36.790220334810435
2013	36.12661764705882
2014	37.09300716716938
2015	37.092553895674065
2016	38.818217020372984
2017	37.84611125849203
2018	37.20387092666674
2019	37.579381643449985
2020	35.18491952758072
2021	35.398876935909676
2022	35.50906364999318