Year	% of revenue
2004	7.916209884098079
2005	5.231359588511156
2006	14.389168366731694
2007	12.433274800788881
2008	15.47199490715802
2009	27.968666605437694
2010	31.307419739270415
2011	27.36335767514892
2012	21.216777512531262
2013	24.957764064275718
2014	16.3325218670058
2015	16.688576431955703
2016	17.427896147659595
2017	20.641718279899983
2018	29.363004402415015
2019	25.489400394008698
2020	22.587305251461284
2021	15.672947834214982
2022	19.177983786742793