Year	% gross
1970	52.6895713806152
1971	52.733081817627
1972	53.303108215332
1973	54.3058891296387
1974	55.8460006713867
1975	57.1358985900879
1976	58.1852188110352
1977	58.8791694641113
1978	59.596549987793
1979	59.7854118347168
1980	60.500560760498
1981	59.2326507568359
1982	59.8764190673828
1983	60.4028091430664
1984	61.0650482177734
1985	61.7621002197266
1986	62.3253211975098
1987	63.0638389587402
1988	63.427978515625
1989	63.6519012451172
1990	64.2817764282227
1991	63.7534599304199
1992	62.8111610412598
1993	61.1606292724609
1994	58.3702583312988
1995	58.1340103149414
1996	58.631031036377
1997	58.7119293212891
1998	58.606071472168
1999	57.1023292541504
2000	57.7662887573242
2001	58.8761596679688
2002	60.1881484985352
2003	62.3053817749023
2004	62.6238594055176
2005	64.6493606567383
2006	66.0407104492188
2007	67.2501602172852
2008	68.898681640625
2009	69.5765762329102
2010	70.7455596923828
2011	71.8458633422852
2012	72.5586776733398
2013	71.9818115234375
2014	72.7073593139648
2015	73.5469970703125
2016	74.3987884521484
2017	74.3827972412109
2018	75.3450317382813
2019	76.2910995483398
2020	77.8810806274414