Year	% of revenue
1990	40.94693737046307
1991	34.264811509027396
1992	37.047951131269166
1993	43.671390957516145
1994	48.288731586793574
1995	46.18116534835087
1996	52.119122699675245
1997	55.40881483921806
1998	61.36805996782042
1999	62.77437340073953
2000	60.2806844745958
2001	53.20799129693386
2002	55.20079321902007
2003	55.98725013655629
2004	57.87282382884699
2005	51.687631412432026
2006	56.34670560948371
2007	58.53974314991871
2008	58.14157519542545
2009	56.39238098270912
2010	57.022369476646816
2011	56.2452483028263
2012	56.69950651329424
2013	56.208787228704246
2014	50.688862955755965
2015	52.36633170937148
2016	49.854258977580734
2017	51.40648432921856
2018	52.35424423167565
2019	52.74126881993762
2020	52.619014712951554
2021	52.649860644737366
2022	53.618341764941505