Year	% of revenue
1995	32.494709616741126
2002	25.095538249338507
2003	24.62822342508183
2004	23.128270126992227
2005	25.771186661538042
2006	24.78675784414062
2007	26.058852947033138
2008	28.268609576058633
2009	25.839882090275484
2010	24.73645352390968
2011	21.993920072936522
2012	22.669022643711397
2013	23.707673878382057
2014	21.75825513908302
2015	21.86336289977402
2016	21.201343674147495
2017	20.7380802868511
2018	20.491265063292733
2019	19.275098992836153
2020	17.57594885062878
2021	20.104467904860275
2022	18.598602575453818