Year	% of revenue
2005	11.40647321963773
2006	10.095983233681538
2007	11.617502895838525
2008	9.788779478204779
2009	10.921343321728468
2010	9.921902532997708
2011	8.653695941441345
2012	9.43097358797442
2013	9.202409541559641
2014	11.133473768586311
2015	9.48148919379114
2016	8.649355941179675
2017	8.934751228745448
2018	9.003070054828541
2019	8.232160793235552
2020	9.152912896687608
2021	8.25190977066738
2022	7.662405987092957