Year	% of revenue
2005	14.352965496228794
2006	13.608307470290102
2007	42.702958120900746
2008	12.887462357249287
2009	11.617612489074311
2010	9.073315652040668
2011	8.238755204851502
2012	7.919946259680426
2013	9.569927903976302
2014	9.30548985881216
2015	10.953713742795442
2016	10.362321390759693
2017	8.599026837625203
2018	7.398614867875668
2019	9.481381769633927
2020	8.085175183678142
2021	6.420869256098872
2022	7.244482156208103