Year	% gross
1970	41.0669593811035
1971	41.0999908447266
1972	41.327220916748
1973	42.780948638916
1974	44.6813316345215
1975	46.4709815979004
1976	48.0471611022949
1977	48.2150688171387
1978	47.8093910217285
1979	48.0522003173828
1980	48.6991882324219
1981	50.2985382080078
1982	51.3955917358398
1983	53.0545806884766
1984	54.7829208374023
1985	56.1902694702148
1986	58.2023811340332
1987	58.8703689575195
1988	59.0832099914551
1989	58.9831085205078
1990	59.6298408508301
1991	61.1160888671875
1992	61.9898490905762
1993	62.9811897277832
1994	64.3626708984375
1995	65.0618667602539
1996	66.7008666992188
1997	66.8937377929688
1998	69.1793594360352
1999	67.3281021118164
2000	66.9965209960938
2001	68.2127914428711
2002	69.4967269897461
2003	70.1000671386719
2004	70.0719604492188
2005	73.7223205566406
2006	72.7011184692383
2007	73.4635925292969
2008	74.2765808105469
2009	74.6150894165039
2010	76.2743835449219
2011	78.1654968261719
2012	79.7136688232422
2013	76.6170883178711
2014	75.3286666870117
2015	78.0284576416016
2016	78.9518432617188
2017	79.5012664794922
2018	79.8752288818359
2019	80.4141693115234
2020	80.7832870483398