Year	% of revenue
2000	11.333399256669393
2001	11.0371564986135
2002	11.636748539639692
2003	10.991229232346583
2004	12.144488573868957
2005	12.352414830523145
2006	3.752333557102974
2007	11.135371179039302
2008	8.54584988011887
2009	9.902191564242308
2010	10.090074715616684
2011	11.071622649711987
2012	11.137233100802971
2013	9.482776175123027
2014	12.990790111488124
2015	11.205465589196848
2016	9.304196272958842
2017	9.5007299270073
2018	11.092882085076056
2019	9.878386023436056
2020	10.708269898908695