Year	% gross
1970	46.0787582397461
1971	46.2686195373535
1972	46.6886215209961
1973	48.3693695068359
1974	50.9578590393066
1975	52.971981048584
1976	54.9486503601074
1977	55.156078338623
1978	54.9218711853027
1979	55.3364295959473
1980	56.0882606506348
1981	57.808708190918
1982	58.1432800292969
1983	59.8404502868652
1984	61.3455009460449
1985	62.0576782226563
1986	63.7582397460938
1987	63.6783218383789
1988	63.202278137207
1989	63.6807899475098
1990	64.5548477172852
1991	65.8509674072266
1992	66.5492172241211
1993	67.3291397094727
1994	68.1717834472656
1995	68.4297714233398
1996	70.0262069702148
1997	70.0990829467773
1998	72.0166015625
1999	72.1846466064453
2000	71.8116912841797
2001	73.3847427368164
2002	75.043830871582
2003	74.8193130493164
2004	74.0272216796875
2005	77.3197021484375
2006	75.1980133056641
2007	75.0666198730469
2008	75.147102355957
2009	75.3292388916016
2010	77.0676422119141
2011	78.762580871582
2012	80.1085586547852
2013	80.5175476074219
2014	79.0070877075195
2015	81.4148025512695
2016	82.6146469116211
2017	82.7543487548828
2018	82.9233474731445
2019	83.1714935302734
2020	83.773681640625