Year	% of revenue
2005	-15.841694862191478
2006	5.031339922975945
2007	3.1496415807765583
2008	4.835614499333857
2009	3.7084390054549976
2010	4.4386741560510545
2011	4.7209375352172005
2012	4.70879547674531
2013	4.116214968599356
2014	2.8375641474794215
2015	2.3597175794216554
2016	2.2730591464743086
2017	2.306592744688448
2018	1.9061491722566195
2019	1.8505984653545324
2020	1.833674332790635
2021	1.6671583978960396
2022	1.6108192678876647