Year	% of revenue
2004	25.728079408925552
2005	18.919286375743717
2006	18.179968284546895
2007	19.036774985450016
2008	17.063792361902753
2009	16.697678016816567
2010	10.012706381471814
2011	10.31328664357102
2012	10.415359093307739
2013	12.069606714085232
2014	11.887157617980723
2015	17.427290267469157
2016	12.57691255663815
2017	14.121635997498775
2018	14.227169177125912
2019	15.97132354730341
2020	15.792167161405493
2021	20.46567830129306
2022	18.22363643116062