Year	% gross
1971	12.7147197723389
1972	12.3430404663086
1973	13.0198097229004
1974	14.214879989624
1975	15.1981601715088
1976	16.6677207946777
1977	17.7888202667236
1978	18.1281509399414
1979	18.5287094116211
1980	18.5483894348145
1981	18.5771293640137
1982	17.9157905578613
1983	17.0109806060791
1984	16.9800796508789
1985	16.920129776001
1986	17.306619644165
1987	17.5986194610596
1988	18.2754707336426
1989	20.1614398956299
1990	20.4570407867432
1991	21.6214809417725
1992	21.1567802429199
1993	23.3999900817871
1994	26.9334697723389
1995	30.6081199645996
1996	34.5782890319824
1997	39.1706199645996
1998	38.7694892883301
1999	44.8125495910645
2000	50.4036293029785
2001	56.3456916809082
2002	59.5361404418945
2003	60.6214714050293
2004	61.7436981201172
2005	63.7791404724121
2006	65.0900726318359
2007	66.9424667358398
2008	70.2946319580078
2009	72.6793594360352
2010	76.5571212768555
2011	75.8021011352539
2012	75.0382919311523
2013	73.317268371582
2014	70.2389678955078
2015	69.3731994628906
2016	69.8503799438477
2017	70.6174621582031
2018	71.0217437744141
2019	70.9065017700195
2020	70.9730377197266
2021	70.9335021972656
2022	73.979377746582