Year	% of revenue
2005	5.574837310195227
2006	4.613516433475897
2007	4.028153161029006
2008	2.939065035032046
2009	2.6410167959282242
2010	1.7978016297682995
2011	1.2535138622927628
2012	1.0373342427655565
2013	1.5711978081855376
2014	1.8366937814760453
2015	2.8359493994746794
2016	3.1136292907012253
2017	3.46609727482339
2018	3.849641653062277
2019	3.92408959297592
2020	6.434244921897441
2021	6.645793416772556
2022	7.239902618272363