Year	% of revenue
2010	8.918629470695372
2012	9.49948207854234
2013	9.482776175123027
2014	9.158519669229435
2015	10.573941849492368
2016	9.829758154271849
2017	9.859002243089623
2018	11.004683446450482
2019	10.134982977796405
2020	9.607517652128326
2021	10.31178881111671