Year	% of revenue
2005	2.485105935369385
2006	2.9526494874866174
2007	3.943145346171481
2008	2.099094127157224
2009	3.2099850653621296
2010	4.208183067236572
2011	4.549268761307702
2012	4.155524192107869
2013	4.000480228124791
2014	3.4985602417243156
2015	3.2542899978616915
2016	2.8567329075564816
2017	4.554881692965229
2018	4.570999153680704
2019	4.964376467423386
2020	3.783680369052589
2021	4.962401673770189