Year	% of revenue
2006	75.7596744829422
2007	79.51991877067877
2008	77.43505690272617
2009	61.75567651567297
2010	71.52968111998742
2011	75.21566469698989
2012	68.72077636110504
2013	65.94963826194422
2014	65.71580789204191
2015	56.545102286591074
2016	62.0230894404205
2017	65.61505238519496
2018	68.8398309017465
2019	50.003043268780175
2020	44.2683761843929
2021	64.93106980645571
2022	75.0623145436397