Year	% of revenue
2010	20.709355004383358
2011	23.429558354528968
2012	29.54656099570413
2013	31.968434013027835
2014	35.496581707542276
2015	33.11537735382304
2016	35.770900942272796
2017	44.29575522041424
2018	39.795670005227606
2019	50.25630501461625
2020	37.81598901063348
2021	34.71184546525071
2022	37.29684355803349