Year	% gross
1971	6.11105012893677
1972	6.66285991668701
1973	7.16093015670776
1974	7.84310007095337
1975	7.61340999603271
1976	9.50543022155762
1977	10.8792600631714
1978	9.35783004760742
1979	10.9991598129272
1980	10.782130241394
1981	11.0878496170044
1982	11.5934600830078
1983	12.111780166626
1984	13.5224103927612
1985	14.6520299911499
1986	13.8041896820068
1987	16.7336196899414
1991	26.1494007110596
1992	28.8429393768311
1993	34.2960815429688
1994	38.4372215270996
1995	41.4516410827637
1996	44.2038612365723
1998	49.985668182373
1999	51.7651786804199
2015	66.9743576049805
2016	68.2400283813477
2017	69.6230926513672
2018	70.8061218261719
2019	72.0282974243164
2020	74.0772094726562
2021	78.3415222167969