Year	% of revenue
1992	15.684622110183135
1993	16.83858273311951
1994	15.210662350852612
1995	14.137402011941079
1996	14.576427129850325
1997	11.46987587042083
1998	7.903489784066312
1999	9.122141344873164
2000	9.246815752875573
2001	7.4426266538481665
2002	8.24804341797282
2003	5.661005540277684
2004	6.953916296283399
2005	6.2924206717527955
2006	5.619138331053637
2007	5.432781996514817
2008	6.342608820634149
2009	5.328572662405869
2010	4.516951915467227
2011	4.7209375352172005
2012	4.8235222862296885
2013	4.123711812129486
2014	4.0430058535827
2015	3.552493602577572
2016	3.496059066266067
2017	3.274173719674195
2018	3.722741284188638
2019	3.0122126955232917
2020	3.8747407149202973
2021	4.040507571840344
2022	3.0903336835103206