Year	% gross
1970	54.3535690307617
1971	54.2297782897949
1972	56.848690032959
1973	58.680549621582
1974	59.5995292663574
1975	62.5850601196289
1976	65.1675796508789
1977	67.1630630493164
1978	68.6631774902344
1979	69.5882110595703
1980	72.9500885009766
1981	73.0525283813477
1982	75.1153793334961
1983	76.5970916748047
1984	78.4085998535156
1985	78.9605026245117
1986	80.3865966796875
1987	81.7058029174805
1988	82.5813980102539
1989	83.1449203491211
1990	85.0369110107422
1991	85.8881607055664
1992	84.1963806152344
1993	84.5806732177734
1994	86.3645935058594
1995	85.2317581176758
1996	85.4828033447266
1997	87.2580413818359
1998	88.2079162597656
1999	89.1595306396484
2000	89.7713165283203
2001	90.9310836791992
2002	92.398323059082
2003	93.7994766235352
2004	94.7441711425781
2005	94.8843231201172
2006	95.7903137207031
2007	96.410270690918
2008	96.4712677001953
2009	96.6183090209961
2010	96.8148193359375
2011	96.0037002563477
2012	97.8235168457031
2013	98.4701538085938
2014	95.9312973022461
2015	95.5628433227539
2016	95.3329696655273
2017	95.4723663330078
2018	95.7270126342773
2019	96.1561279296875
2020	96.6984024047852
2021	96.6864700317383
2022	95.1877899169922