Year	% of revenue
2005	14.376068421217129
2006	11.392029856639095
2007	11.737386989319006
2008	14.631016836015723
2009	13.560042173509371
2010	12.131536994779783
2011	10.50603318250377
2012	11.778013272906286
2013	13.049698387182776
2014	10.299910639650875
2015	11.248352566229276
2016	9.564364586691612
2017	10.260322794817064
2018	7.770074950833024
2019	10.03313151683605
2020	7.1287115436112
2021	8.876788337000113