Year	% gross
1971	61.2172012329102
1972	62.8166885375977
1973	64.9497604370117
1974	66.7927474975586
1975	67.5909194946289
1976	70.2907867431641
1977	71.4316711425781
1978	72.0353698730469
1979	72.0359420776367
1980	71.9077911376953
1981	71.3635787963867
1982	71.2060089111328
1983	71.8079681396484
1984	72.8970031738281
1985	74.0624084472656
1986	75.3639526367188
1987	76.4866790771484
1988	77.624137878418
1989	78.9456176757812
1990	80.5410385131836
1991	81.5709075927734
1992	83.2472610473633
1993	84.8202896118164
1994	89.5760116577148
1995	91.3358383178711
1996	92.4882431030273
1997	93.1332931518555
1998	93.3950881958008
1999	94.5567932128906
2000	94.7994384765625
2001	97.2841567993164
2002	98.8140716552734
2003	99.5260696411133
2004	99.0745010375977
2005	99.2049789428711
2006	99.5330429077148
2007	99.8370208740234
2008	100.290672302246
2009	100.174812316895
2010	101.400543212891
2011	101.596008300781
2012	100.44953918457
2013	100.972801208496
2014	101.121238708496
2015	101.227523803711
2016	100.742156982422
2017	101.009132385254
2018	101.525367736816
2019	101.740547180176
2020	101.834747314453
2021	102.331283569336