Year	% of revenue
2005	9.841958475364116
2006	8.56897952623731
2007	9.649696181870153
2008	10.386880503164239
2009	13.329182565380782
2010	10.876098998949486
2011	11.516832069827124
2012	11.614289785182388
2013	11.698213265822488
2014	12.837893518892384
2015	12.436248553495115
2016	11.930598334491462
2017	13.705860063915488
2018	13.06906752762046
2019	12.028379026528633
2020	15.026438055075491
2021	15.55514516037835
2022	17.53773787155227