Year	% of revenue
1984	24.565426042444276
1985	24.495372410753635
1986	24.54453161052146
1987	24.308596887360014
1988	21.31208571688005
1994	24.588395594413534
1995	30.592156542524368
1996	27.65631797715705
1997	33.321483221787716
1998	34.26744722759201
1999	40.599335178675915
2000	40.24448461797322
2001	41.58723580605056
2002	39.72638723235077
2003	39.273550842217816
2004	39.94395789943958
2005	39.22127641009358
2006	38.26531884302878
2007	37.045326260836134
2008	35.95028115649346
2009	37.96058427579445
2010	36.6680625863861
2011	36.94744703431469
2012	39.40222096743835
2013	41.0955087379774
2014	40.63300371334256
2015	40.85764497206979
2016	41.36134379641112
2017	40.62451918983393
2018	40.275857735327385
2019	40.58570730336083
2020	40.82112574990603
2021	38.054512760654916
2022	39.67766633635199