Year	% gross
1970	8.18513965606689
1971	8.54471969604492
1972	8.89268970489502
1973	9.32110023498535
1974	9.77486991882324
1975	10.606840133667
1976	11.8569803237915
1977	12.9096202850342
1978	13.8148899078369
1979	15.4387702941895
1980	16.6196708679199
1981	18.7437801361084
1982	21.5763492584229
1983	23.8329296112061
1984	26.5558300018311
1985	28.306619644165
1986	30.8459396362305
1987	38.3349914550781
1988	38.7822418212891
1989	39.272819519043
1990	43.2160491943359
1991	41.1648788452148
1992	43.2459716796875
1993	45.1026496887207
1994	45.9176483154297
1995	47.6717681884766
1996	49.2843894958496
1997	50.3002281188965
1998	51.742919921875
1999	53.5833587646484
2000	54.5259704589844
2001	55.2614212036133
2002	55.591968536377
2003	56.9079704284668
2004	58.1366691589355
2005	60.1763191223145
2006	62.5233192443848
2007	64.1285400390625
2008	66.1396102905273
2009	66.3557662963867
2010	72.9093933105469
2011	74.9140090942383
2012	75.8223419189453
2013	69.6208572387695
2014	71.5757369995117
2015	72.4812393188477
2016	73.8868408203125
2017	75.3163986206055
2018	76.0193710327148
2019	75.8896636962891
2020	75.1708984375