Year	% of revenue
1995	24.162396531336224
1996	32.98816568047337
1997	42.6919032597266
1998	37.879858657243815
1999	47.83132902587566
2000	46.43793457198222
2001	45.16800360386279
2002	50.19787916417271
2003	46.312381554011374
2004	39.69125061348325
2005	47.76350752878653
2006	47.040367537888336
2007	49.591263779365015
2008	46.23094927549179
2009	50.06119951040392
2010	50.20799651219823
2011	52.29034639758814
2012	51.47257272436387
2013	46.61800423075918
2014	49.18713786333381
2015	45.13593795123561
2016	41.60712921219531
2017	46.92367273400798
2018	49.60643841497807
2019	50.30312973057621
2020	48.585259533605516
2021	52.07205573829936
2022	48.24483873769395