Year	% gross
1970	10.618860244751
1971	10.559100151062
1972	10.5634803771973
1973	10.4366397857666
1974	10.5265398025513
1975	12.054479598999
1976	13.7269296646118
1977	14.3933696746826
1978	14.661190032959
1979	15.8146800994873
1980	15.9800596237183
1981	16.1174907684326
1982	16.1697406768799
1983	16.0881195068359
1984	16.3256492614746
1985	15.7620801925659
1986	15.6520795822144
1987	15.7888202667236
1988	15.7968997955322
1989	16.3797397613525
1990	16.4224090576172
1991	16.6473598480225
1992	16.9556102752686
1993	16.4725494384766
1994	16.4882202148438
1995	16.5074996948242
1996	17.0174808502197
1997	17.8172206878662
1998	18.2072105407715
1999	17.7849903106689
2000	18.4617595672607
2001	18.7089996337891
2002	19.3775596618652
2003	19.9579906463623
2004	20.61083984375
2005	21.7907104492188
2006	24.0459403991699
2007	24.1979293823242
2008	25.6293792724609
2009	27.1107597351074
2010	28.2057590484619
2011	27.4229393005371
2012	27.3741493225098
2013	27.4887008666992
2014	30.4202404022217
2015	31.7201995849609
2016	31.5474891662598
2017	32.0869407653809
2018	32.4587898254395
2019	33.5146408081055
2020	33.897331237793