Year	% gross
1970	36.2975006103516
1971	38.9282684326172
1972	43.2862892150879
1973	47.7749481201172
1974	49.9616203308105
1975	52.4375381469727
1976	55.2842483520508
1977	56.995189666748
1978	58.7700996398926
1979	59.0892715454102
1980	57.4742088317871
1981	57.109260559082
1982	56.2733917236328
1983	55.6755218505859
1984	56.5023307800293
1985	56.7620086669922
1986	56.6992492675781
1987	57.1902503967285
1988	56.9915008544922
1989	56.7810592651367
1990	58.8103408813477
1999	61.836311340332
2000	62.4418983459473
2001	64.1151580810547
2002	65.4936828613281
2004	65.0667190551758
2005	65.352783203125
2006	64.9231567382812
2007	65.6790084838867
2008	66.6439208984375
2009	68.1464996337891
2010	70.1725234985352
2011	69.4989700317383
2013	74.2745819091797
2014	73.4914093017578
2015	74.7433471679688
2016	81.6119537353516
2017	74.5812530517578
2021	81.1119995117188