Year	% of revenue
2005	8.394793926247289
2006	8.201112529799905
2007	6.579208631569604
2008	7.00933230318663
2009	5.940978494207492
2010	7.917912899665108
2011	7.517084403727571
2012	6.569076780019534
2013	6.16301341519427
2014	6.233897049063715
2015	5.309101956711581
2016	4.448243046272038
2017	5.995746409784868
2018	6.262871656315373
2019	4.843309976405713
2020	5.0328141404695295
2021	5.434598809064507
2022	5.726373450505966