Year	% of revenue
2006	1.3712310990478815
2007	1.31109634459391
2008	0.9912552874758297
2009	1.8580374901291756
2010	2.1203838541937627
2011	1.9051935338253005
2012	2.994940863803526
2013	2.088634309213441
2014	2.427839824447974
2015	4.743397410344829
2016	7.100272612145305
2017	6.1052197807501045
2018	6.503295318684428
2019	7.829527689068942
2020	10.365961448281283
2021	5.971940780521407
2022	3.952384753919543