Year	% of revenue
2010	22.934621145859023
2011	24.64593908671983
2012	22.738724062737436
2013	23.610163536734326
2014	24.15175054600278
2015	22.86358319357933
2016	24.355489408865708
2017	25.01521105347468
2018	24.501440335230722
2019	24.851322658038818
2020	26.917309184413018
2021	28.34027293081998
2022	30.4421516881566