Year	% of revenue
2002	4.785660372331778
2003	3.8564983147535736
2004	4.085552740639078
2005	3.6469897780072156
2006	3.0564089725468806
2007	1.987508071072916
2008	2.0124265095096634
2009	2.1867188456950024
2010	2.4260143967580796
2011	2.7014083335083883
2012	3.2755063042677715
2013	2.4108320445606712
2014	3.3313071313876654
2015	3.4243260255841927
2016	4.629563984402694
2017	4.471594719993231
2018	5.720426168972923
2019	6.083435749282201
2020	7.22215591342414
2021	8.623793979275973
2022	8.621135098523068