Year	% gross
1970	46.2633781433105
1971	46.4411201477051
1972	46.8738899230957
1973	48.7283592224121
1974	51.1150894165039
1975	53.3047103881836
1976	55.1342086791992
1977	55.3126106262207
1978	55.0327987670898
1979	55.4436683654785
1980	56.2049293518066
1981	57.9664916992188
1982	58.3480491638184
1983	59.5849914550781
1984	61.0148391723633
1985	61.829288482666
1986	63.503231048584
1987	63.8575210571289
1988	63.90380859375
1989	63.7198295593262
1990	64.7450790405273
1991	66.0448532104492
1992	66.585319519043
1993	67.5746231079102
1994	68.5501174926758
1995	68.998161315918
1996	70.3559036254883
1997	70.2724761962891
1998	72.1148681640625
1999	72.1335830688477
2000	71.7074203491211
2001	73.2119827270508
2002	74.8152313232422
2003	75.0149765014648
2004	74.6250991821289
2005	77.7913436889648
2006	75.2900695800781
2007	75.2339477539063
2008	75.3642425537109
2009	75.5282821655273
2010	77.2096786499023
2011	78.883186340332
2012	80.1685104370117
2013	80.6011276245117
2014	78.867301940918
2015	81.8413696289063
2016	82.8042831420898
2017	82.8209228515625
2018	82.870002746582
2019	83.5631103515625
2020	83.7960662841797