Year	% gross
1973	72.7208480834961
1974	73.6251983642578
1975	73.9447479248047
1976	74.2834396362305
1977	74.7412872314453
1978	76.1987380981445
1979	78.2354965209961
1980	80.5219802856445
1981	81.3817291259766
1982	83.4341201782227
1983	85.238639831543
1984	85.8935394287109
1985	87.0350189208984
1986	84.9221267700195
1987	84.7304229736328
1988	84.4568023681641
1989	84.4346008300781
1990	83.9984893798828
1991	85.4614028930664
1992	87.0006713867188
1993	87.2494506835938
1994	87.6735000610352
1995	88.6371765136719
1996	87.9628829956055
1999	97.577507019043
2000	98.0492706298828
2001	97.8029403686523
2002	99.26904296875
2003	98.2558288574219
2004	97.1919403076172
2005	96.9749221801758
2006	96.7052764892578
2007	96.2301025390625
2008	95.0427474975586
2009	95.8039016723633
2010	96.5111923217773
2011	96.3081588745117
2012	96.2935409545898
2013	96.4981536865234
2014	96.3290405273438
2015	96.3389511108398
2016	96.7928085327148
2017	96.2929916381836
2018	96.6557464599609
2019	96.2954177856445
2020	96.1416931152344
2021	96.9270782470703