Year	% gross
1971	99.3068237304688
1972	100.063339233398
1973	101.683639526367
1974	105.997352600098
1975	109.808143615723
1976	113.249618530273
1977	112.336982727051
1978	109.03832244873
1979	106.334716796875
1980	105.423789978027
1981	106.176887512207
1982	107.428771972656
1983	110.941818237305
1984	113.72380065918
1985	116.966911315918
1986	107.039886474609
1987	103.796806335449
1988	98.3703994750977
1989	97.0794372558594
1990	97.4684524536133
1991	99.9135284423828
1992	100.972747802734
1993	98.3484268188477
1994	98.0423812866211
1995	99.7254867553711
1996	100.536552429199
1997	99.4851913452148
2011	90.0485382080078
2012	90.7435302734375
2013	93.1775665283203
2014	93.9517288208008
2015	95.2922210693359
2016	95.2684936523438
2017	94.3777923583984
2018	89.7750396728516
2019	89.7222137451172
2020	92.8293533325195