Year	% of revenue
2010	4.684051102548846
2011	5.2502846055409735
2012	5.476772108541988
2013	5.63903702693068
2014	6.73654293588252
2015	7.24262453652013
2016	7.128243821148775
2017	5.51734500328828
2018	6.6013711713498955
2019	5.343231948254077
2020	5.758912208009312
2021	6.172469911376317
2022	5.351432629225404