Year	% of revenue
2009	7.32536589287948
2010	7.32536589287948
2011	8.076626041866271
2012	2.5132396565610415
2013	2.407646441837416
2014	2.9204418192124173
2015	2.4073099733353853
2016	3.180649277349073
2017	2.7265813571870776
2018	2.3767994708707474
2020	1.7845311834156392
2021	1.582693295108846
2022	1.4447524493425026