Year	% of revenue
2005	28.13035843404607
2006	28.293615007544844
2007	28.3592869854324
2008	25.782922565766626
2009	26.254826190826435
2010	23.417956605383043
2011	23.979934779109374
2012	24.91788935688475
2013	22.965364043147595
2014	15.249102630512667
2015	19.816599066199572
2016	27.909588925711446
2017	18.732979634839975
2018	21.74872759701259
2019	35.101887895834885
2020	19.84584637873525
2021	17.35157122492661
2022	16.03400565822536