Year	% of revenue
2012	0.7228844187020972
2014	0.6491822047594035
2015	1.250214108660927
2016	1.2443431529595608
2017	1.3641227594290224
2018	1.5612802431344357
2019	1.6896706255075313
2020	1.203777526772737
2021	1.154488377309654