Year	% of revenue
1995	4.63849600281121
2001	6.9972877047340925
2002	6.281062788001243
2003	7.915506035283195
2004	11.37288498607839
2005	13.66271046094397
2006	8.65058853462244
2007	14.550110580840414
2008	18.75208342662109
2009	22.43153050015527
2010	15.898988263089702
2011	14.451980502084394
2012	15.377981091271803
2013	16.033695180848994
2014	15.322286560121102
2015	15.373623759459504
2016	10.11884557028759
2017	8.348163821509056
2018	8.31502568417566
2019	8.433464014153243
2020	6.78594237400559
2021	5.580226148282675
2022	6.007322732686847