Year	% of revenue
2011	10.747333999629248
2012	10.157353117070056
2013	7.315645029325523
2014	6.215481330580406
2015	5.689757072973567
2016	7.508235340707342
2017	7.210719183131399
2018	6.013585126486316
2019	6.292848528794233
2020	6.525021263530964
2021	8.231359255199889
2022	8.734957414754101