Year	% gross
1971	37.7141609191895
1972	38.6355781555176
1973	40.0851402282715
1974	43.2021713256836
1975	45.6541595458984
1976	47.1262588500977
1977	48.2228507995605
1978	50.7681312561035
1979	55.3751602172852
1980	58.2028312683105
1981	59.7787895202637
1982	58.9459495544434
1983	56.3735008239746
1984	55.2104797363281
1985	55.8762092590332
1986	55.7184295654297
1987	56.1074714660645
1988	58.3543090820313
1989	61.5731086730957
1990	62.4594612121582
1991	57.3232612609863
1992	55.3524703979492
1993	54.451831817627
1994	50.165470123291
1995	52.2423286437988
1996	53.0902404785156
1997	54.4563789367676
1998	58.2127494812012
1999	66.9761276245117
2000	70.6800918579102
2001	73.9495315551758
2002	75.0859069824219
2003	74.8562164306641
2004	73.0332412719727
2005	74.8874282836914
2006	75.8351135253906
2007	76.7765731811523
2008	77.9613265991211
2009	79.471809387207
2010	80.489013671875
2011	80.9261627197266
2012	79.6147918701172
2013	88.6059494018555
2014	85.1414184570313
2015	85.1959991455078
2016	82.9543304443359
2017	84.0216064453125
2018	88.48486328125
2019	93.860107421875
2020	94.9807434082031