Year	% of revenue
2009	4.461086693355827
2010	4.461086693355827
2011	4.392882668574524
2012	4.85322794989012
2013	6.401587267878041
2014	8.435022926953167
2015	9.418920691583697
2016	10.429920855900543
2017	9.92983630531227
2018	10.345749010458738
2020	10.415168098144706
2021	11.464774830671875
2022	11.407308731214865