Year	% of revenue
2008	13.344516516608195
2009	10.299349851753139
2010	10.555922949991865
2011	12.81391869586418
2012	13.592310312338268
2013	13.943297863249596
2014	13.898707501596085
2015	15.537868174754184
2016	14.997552970018766
2017	15.465186936300238
2018	16.520304255941923
2019	15.206566398877058
2020	15.431692308091925
2021	13.919372812722191
2022	15.0699673129422