Year	% of revenue
2002	1.9027279723965014
2003	2.7151583421267476
2004	2.371152579401384
2005	2.1082167163849457
2006	1.9300362768232604
2007	1.772985973095894
2008	2.4677231225413703
2009	1.9728066633862704
2010	1.928208507428265
2011	1.5153446711035148
2012	1.4631773267466368
2013	1.619257645234908
2014	1.8707981199364054
2015	1.789346685459965
2016	2.0418291386033323
2017	4.2207910018387835
2018	1.5370262104342216
2019	1.5024383376850885
2020	1.743572748581287
2021	1.7910330462094262
2022	1.8058312579727749