Year	% gross
1970	25.228910446167
1971	25.1442909240723
1972	26.3832893371582
1973	27.2759990692139
1974	27.8509197235107
1975	29.4633407592773
1976	31.3361892700195
1977	31.3441791534424
1978	32.0700607299805
1979	31.995210647583
1980	32.6073989868164
1981	33.4764709472656
1982	34.228630065918
1983	34.8671989440918
1984	35.4231300354004
1985	35.9514617919922
1986	36.437141418457
1987	37.1883506774902
1988	38.1188507080078
1989	39.1253089904785
1990	40.2415390014648
1991	41.6464385986328
1992	43.850471496582
1993	46.7044906616211
1994	49.0358390808105
1995	50.7240905761719
1996	52.2762718200684
1997	53.3646392822266
1998	52.7259712219238
1999	54.5643310546875
2000	55.9870300292969
2001	58.0646209716797
2002	60.2700500488281
2003	62.3763313293457
2004	64.121711730957
2005	65.8170471191406
2006	66.8221282958984
2007	67.6352920532227
2008	68.3795700073242
2009	69.3047027587891
2010	70.6451721191406
2011	71.9270629882812
2012	72.8950805664062
2013	73.7822189331055
2014	74.566276550293
2015	75.1782073974609
2016	75.8869705200195
2017	76.1962203979492
2018	76.4603271484375
2019	77.334716796875
2020	77.8186111450195
2021	79.0895614624023
2022	79.2583465576172