Year	% gross
1971	20.4700107574463
1972	21.8799095153809
1973	23.2061901092529
1974	24.4828605651855
1975	26.3694705963135
1976	29.1275596618652
1977	32.0432014465332
1978	33.6763305664062
1979	35.1991996765137
1980	36.1387596130371
1981	37.7639083862305
1982	39.6483192443848
1983	41.5091590881348
1984	43.3020210266113
1985	45.2093200683594
1986	47.929759979248
1987	50.1258697509766
1988	50.7962493896484
1989	50.5927314758301
1990	61.5523414611816
1991	62.8556098937988
1992	60.0396308898926
1993	60.8958282470703
1994	65.1431503295898
1995	64.6969833374023
1996	62.7003211975098
1997	66.5411224365234
1999	74.2267379760742
2000	76.4897766113281
2001	78.4902572631836
2003	78.140998840332
2004	77.5656890869141
2009	63.8791313171387
2010	64.686767578125
2011	73.4140319824219
2012	74.1539306640625
2013	75.1677398681641
2014	75.520378112793
2016	77.6299133300781
2017	78.2497329711914
2018	78.9118576049805
2019	80.1625823974609
2020	81.8917007446289
2021	84.0204086303711