Year	% gross
1970	38.2630310058594
1971	40.9611282348633
1972	45.137809753418
1973	49.4340209960938
1974	52.5461807250977
1975	54.9533081054688
1976	57.5155906677246
1977	59.635440826416
1978	61.6302909851074
1979	62.0729713439941
1980	60.8097190856934
1981	60.4244499206543
1982	59.4875183105469
1983	58.9916191101074
1984	59.7757911682129
1985	59.814079284668
1986	59.9889793395996
1987	60.1593894958496
1988	59.7686805725098
1989	59.1589584350586
1990	60.7973403930664
1991	61.1705093383789
1992	61.6468391418457
1993	62.7765197753906
1994	62.759651184082
1995	64.1104736328125
1996	64.4775619506836
1999	64.0488510131836
2000	64.3859405517578
2001	66.3956604003906
2002	67.7060394287109
2004	67.4061279296875
2005	67.6345367431641
2006	67.5453033447266
2007	68.016242980957
2008	69.2000579833984
2009	70.8318099975586
2010	72.4545288085938
2011	72.2515716552734
2013	76.8787384033203
2014	76.4785385131836
2015	77.0092010498047
2016	83.0287094116211
2017	76.9188385009766
2021	82.8730010986328