Year	% gross
1970	9.21872997283936
1971	9.01315021514893
1972	8.8833703994751
1973	8.84792995452881
1974	8.8869104385376
1975	9.35490036010742
1976	11.372540473938
1977	15.4681701660156
1978	13.8243598937988
1979	13.9963998794556
1980	15.2341203689575
1981	16.91090965271
1982	17.2891597747803
1983	18.270149230957
1984	19.2346706390381
1985	20.58544921875
1986	22.187650680542
1987	23.8817691802979
1988	24.744119644165
1989	24.6548309326172
1990	24.54248046875
1991	24.436279296875
1992	24.8902606964111
1993	25.1557197570801
1994	25.1159992218018
1995	25.8824806213379
1996	26.5626201629639
1997	24.7560691833496
1998	29.1616992950439
1999	30.1141300201416
2000	31.461820602417
2001	32.6607093811035
2002	32.908748626709
2003	34.429271697998
2004	36.2123794555664
2005	38.2906913757324
2006	40.991828918457
2007	42.8312797546387
2008	45.1801795959473
2009	47.6152114868164
2010	50.2275314331055
2011	53.3471794128418
2012	57.2146987915039
2013	59.1919097900391
2014	61.8281517028809
2015	63.9172782897949
2016	66.1232070922852
2017	68.1050872802734
2018	69.504997253418
2019	70.6396026611328
2020	70.1190185546875