Year	% gross
1970	10.1718502044678
1971	10.0137796401978
1972	9.86548042297363
1973	9.76410007476807
1974	9.769700050354
1975	10.1737604141235
1976	11.9305200576782
1977	15.4433298110962
1978	14.1099796295166
1979	14.3234395980835
1980	15.4156303405762
1981	16.8249092102051
1982	17.2199401855469
1983	18.1423091888428
1984	19.0413303375244
1985	20.1919193267822
1986	21.56715965271
1987	23.0425491333008
1988	23.8561096191406
1989	23.7658195495605
1990	23.6775608062744
1991	23.6165504455566
1992	23.9152507781982
1993	24.0305595397949
1994	23.8945598602295
1995	24.3506908416748
1996	24.8132400512695
1997	23.2358798980713
1998	26.086540222168
1999	26.7583198547363
2000	27.7411708831787
2001	28.3241691589355
2002	28.1249294281006
2003	29.1644592285156
2004	30.7343597412109
2005	32.3730087280273
2006	34.9388008117676
2007	36.5212097167969
2008	38.3239402770996
2009	40.0597991943359
2010	42.052661895752
2011	44.9626197814941
2012	48.2563095092773
2013	50.3726005554199
2014	50.7052688598633
2015	52.5339889526367
2016	54.3274612426758
2017	56.2012901306152
2018	57.1811790466309
2019	57.9560813903809
2020	57.9855690002441