Year	% gross
1970	53.7499313354492
1971	53.81005859375
1972	54.3812408447266
1973	55.5236701965332
1974	56.8778915405273
1975	58.3488807678223
1976	59.2601318359375
1977	60.0313491821289
1978	60.7896118164063
1979	61.021541595459
1980	61.7456092834473
1981	60.4272994995117
1982	61.121639251709
1983	61.7170906066895
1984	62.4146614074707
1985	63.2380218505859
1986	63.8410415649414
1987	64.5081024169922
1988	64.905029296875
1989	65.1249694824219
1990	65.7681274414063
1991	65.1970977783203
1992	64.0408401489258
1993	62.497428894043
1994	59.6416397094727
1995	59.431468963623
1996	59.8333587646484
1997	59.7178802490234
1998	59.4694709777832
1999	57.7353286743164
2000	58.3016891479492
2001	59.3974800109863
2002	60.6459884643555
2003	62.7900390625
2004	63.0790100097656
2005	65.1063385009766
2006	66.4416122436523
2007	67.6089782714844
2008	69.1827163696289
2009	69.9012985229492
2010	71.0444183349609
2011	72.2021713256836
2012	72.9016265869141
2013	72.4411315917969
2014	73.093620300293
2015	73.9308090209961
2016	74.8734970092773
2017	74.8971328735352
2018	75.8320770263672
2019	76.716796875
2020	78.3423080444336