Year	% gross
1970	8.22163963317871
1971	8.36938953399658
1972	8.50687980651855
1973	8.64783954620361
1974	8.88348007202148
1975	9.51821041107178
1976	10.093469619751
1977	10.6797304153442
1978	11.0714902877808
1979	11.615870475769
1980	12.185079574585
1981	12.92689037323
1982	13.7279396057129
1983	14.4623003005981
1984	15.068229675293
1985	15.5838403701782
1986	16.4115905761719
1987	16.9826107025146
1988	17.6699295043945
1989	17.5433406829834
1990	17.4035606384277
1991	17.8194808959961
1992	17.7967090606689
1993	17.7505798339844
1994	18.1562099456787
1995	18.462589263916
1996	18.661190032959
1997	15.3493404388428
1998	17.4351196289063
1999	18.5659103393555
2000	20.369140625
2001	21.5969505310059
2002	21.9488201141357
2003	23.5123291015625
2004	25.4836406707764
2005	27.9830493927002
2006	31.4509696960449
2007	34.1373481750488
2008	36.5821113586426
2009	38.5501403808594
2010	40.4154014587402
2011	42.7922897338867
2012	45.3757591247559
2013	46.945011138916
2014	48.7072906494141
2015	51.0130081176758
2016	52.6127395629883
2017	54.803840637207
2018	55.5445213317871
2019	56.9716796875
2020	56.7167091369629