Year	% of revenue
1995	30.150224018272866
2001	20.571334965574103
2002	19.767199974906788
2003	16.86784277313525
2004	13.286214035839222
2005	12.220535467844327
2006	8.831367087590557
2007	9.672913514142707
2008	9.05015647466802
2009	7.806612190792249
2010	9.256630592180475
2011	14.326132695599899
2012	10.014187995236274
2013	8.028641277531063
2014	4.806658733386415
2015	8.321598320937998
2016	9.845880055053293
2017	9.701796287607927
2018	10.496907423999856
2019	11.55769992226501
2020	14.470951296779742
2021	14.811339870417376
2022	17.44391055282066