Year	% gross
1970	44.7096214294434
1971	45.6421089172363
1972	47.4727096557617
1973	49.9397087097168
1974	52.7623901367188
1975	54.3875503540039
1976	55.8804817199707
1977	55.6266784667969
1978	55.3437309265137
1979	54.9662895202637
1980	55.6543884277344
1981	56.8338584899902
1982	58.731990814209
1983	59.5923690795898
1984	65.2604827880859
1985	70.2103576660156
1986	70.2377777099609
1987	69.9169235229492
1988	70.3989791870117
1990	72.4082183837891
1991	73.7480773925781
1994	71.0865631103516
1996	78.9764022827148
1997	74.9484329223633
1998	81.1133804321289
1999	92.7628402709961
2000	96.6217880249023
2001	98.0622406005859
2002	97.468132019043
2003	96.5058364868164
2004	95.9976196289062
2005	94.1866607666016
2006	92.9617309570312
2007	92.6104202270508
2008	93.5038223266602
2009	96.6370162963867
2010	99.2300033569336
2011	100.993843078613
2012	102.782302856445
2013	104.596748352051
2014	106.092132568359
2015	107.549072265625
2016	109.645942687988
2017	110.412406921387
2018	109.696998596191
2019	110.498527526855
2020	112.416679382324
2021	116.559448242188