Year	% of revenue
2009	31.847611939541853
2010	31.847611939541853
2011	32.596231953619714
2012	38.627335978652525
2013	34.88147313822252
2014	39.72175496301815
2015	37.880402440824184
2016	44.05651318182495
2017	42.676664619316135
2018	43.011122771589044
2020	36.006365792659444
2021	37.82053742946855
2022	34.84699024133381