Year	% gross
1970	14.7907400131226
1971	14.8742904663086
1972	15.0513200759888
1973	15.2851104736328
1974	15.3455400466919
1975	15.5233201980591
1976	15.8476800918579
1977	16.3301906585693
1978	16.9984493255615
1979	17.5901393890381
1980	18.1429595947266
1981	18.6692905426025
1982	19.4606304168701
1983	19.7453308105469
1984	19.6701507568359
1985	19.3906993865967
1986	19.1127891540527
1987	18.869270324707
1988	18.8503093719482
1989	18.4587097167969
1990	18.1407108306885
1991	18.0367698669434
1992	17.6578102111816
1993	17.4997501373291
1994	17.4185905456543
1995	18.3397903442383
1996	18.2625198364258
1997	18.2661895751953
1998	18.6767406463623
1999	18.9320507049561
2000	19.3434104919434
2001	20.0843391418457
2002	20.9587802886963
2003	22.57253074646
2004	23.5347900390625
2005	24.6463298797607
2006	26.1480903625488
2007	27.2173690795898
2008	28.9931392669678
2009	30.4556999206543
2010	31.8678398132324
2011	33.2378616333008
2012	34.3508491516113
2013	34.0182418823242
2014	34.3167686462402
2015	34.7462310791016
2016	35.1657905578613
2017	35.7803611755371
2018	36.1341590881348
2019	36.0366592407227
2020	36.4504814147949