Year	% gross
1970	50.080379486084
1971	50.0731201171875
1972	50.8412399291992
1973	50.5934600830078
1974	49.9654388427734
1975	54.7693710327148
1976	57.3251914978027
1977	59.4145584106445
1978	60.8387908935547
1979	62.0029602050781
1980	64.1925506591797
1981	62.1628112792969
1982	62.5737495422363
1983	63.6638984680176
1984	63.9085998535156
1985	65.5136032104492
1986	65.7992095947266
1987	67.1687316894531
1988	68.4677505493164
1989	67.1963806152344
1990	68.4784317016602
1991	69.6808624267578
1992	69.4410095214844
1993	67.8278121948242
1994	69.3408432006836
1995	70.9187622070312
1996	72.2137298583984
1997	73.5413284301758
1998	75.2522964477539
1999	76.758903503418
2000	77.3621520996094
2001	78.5115509033203
2002	78.2261810302734
2003	78.8137512207031
2004	81.6390609741211
2005	81.2623291015625
2006	82.3740081787109
2007	83.6033477783203
2008	84.4695663452148
2009	86.4154510498047
2010	85.6355209350586
2011	86.8589172363281
2012	86.0552368164062
2013	84.833740234375
2014	85.1551284790039
2015	84.7184982299805
2016	87.2400207519531
2017	86.0638885498047
2018	85.6322784423828
2019	87.0304107666016
2020	86.4805374145508
2021	84.8889923095703
2022	85.5183029174805