Year	% of revenue
1992	31.186440677966104
1993	26.72897196261682
1994	24.2681488967492
1995	31.177784117718062
1996	31.027294471960293
1997	30.42573302898553
1998	34.25708052047691
1999	34.2823386828062
2000	35.45145012176595
2001	38.10403106576937
2002	40.88287775737671
2003	36.120511886979095
2004	34.14736862972892
2005	33.42076026762961
2006	31.538019109964676
2007	30.286773370334387
2008	28.71853851895439
2009	32.60805560533017
2010	37.239302303851446
2011	33.40380917477158
2012	34.85951982694654
2013	39.60734234514836
2014	39.06142645947045
2015	34.6394667678829
2016	33.23422380152803
2017	31.57494218895428
2018	31.12638715588346
2019	33.386447036900975
2020	35.88492072976605
2021	35.23983376902639
2022	37.11435217386107