Year	% gross
1970	67.712646484375
1971	68.4547119140625
1972	69.2338027954102
1973	71.4806137084961
1974	72.9188079833984
1975	74.5152435302734
1976	75.1709671020508
1977	75.9509582519531
1978	76.1368103027344
1979	76.4423980712891
1980	77.2618179321289
1981	78.2060699462891
1982	79.481201171875
1983	81.2877807617188
1984	83.0898208618164
1985	84.3591003417969
1986	85.8467330932617
1987	85.5700225830078
1988	85.2489471435547
1989	84.95166015625
1990	86.1388626098633
1991	87.6075897216797
1992	88.039436340332
1993	89.1832122802734
1994	90.3796310424805
1995	90.1938629150391
1996	92.2542190551758
1997	93.310920715332
1998	94.0277328491211
1999	94.3965377807617
2000	95.0872192382813
2001	95.8540496826172
2002	96.6116790771484
2003	97.6708374023438
2004	98.3256072998047
2005	99.9130096435547
2006	100.058349609375
2007	99.9122695922852
2008	99.9780883789063
2009	100.029487609863
2010	100.380096435547
2011	100.611976623535
2012	100.734092712402
2013	100.976791381836
2014	100.307800292969
2015	100.339790344238
2016	100.749183654785
2017	100.231788635254
2018	100.441970825195
2019	101.434700012207
2020	102.225891113281