Year	% of revenue
2009	6.52820101118947
2010	5.848062838375485
2011	6.424932552098642
2012	6.9705556140282745
2013	6.9516607142750955
2014	7.975607909618832
2015	7.585271755954351
2016	6.868034039539017
2017	6.979801181995226
2018	7.568959786145349
2019	7.795172127926898
2020	6.692490497516126
2021	6.578693396170708
2022	7.46025146954536