Year	% gross
1970	47.9558715820312
1971	49.9320411682129
1972	51.8949317932129
1973	53.6828498840332
1974	56.7366714477539
1975	58.8949699401855
1976	60.0946006774902
1977	61.5998611450195
1978	62.1985282897949
1979	62.913761138916
1980	62.6832313537598
1981	62.0096702575684
1982	62.9155311584473
1983	62.7619285583496
1984	61.6904182434082
1985	59.9886894226074
1986	59.9534606933594
1987	60.8729400634766
1988	60.7132911682129
1989	60.5237312316895
1990	60.5372314453125
1991	61.3655586242676
1992	64.2288589477539
1993	64.5064926147461
1994	64.6059112548828
1995	64.5045928955078
1996	64.2953262329102
1997	62.0971412658691
1998	61.8252487182617
1999	63.1450691223145
2000	62.5285797119141
2001	62.5650291442871
2002	65.0865936279297
2003	65.8751983642578
2004	66.1149597167969
2005	65.939453125
2006	67.2154769897461
2007	66.9507827758789
2008	68.4162216186523
2009	70.6223068237305
2010	72.42236328125
2011	72.9153518676758
2012	72.3943023681641
2013	72.77197265625
2014	73.3414535522461
2015	73.6644821166992
2016	73.9111404418945
2017	74.2060699462891
2018	74.4652481079102
2019	74.7211074829102
2020	74.8090591430664
2021	74.7745666503906