Year	% gross
1970	41.5032386779785
1971	46.340690612793
1972	52.2051086425781
1973	57.5831718444824
1974	60.9160003662109
1975	60.7884902954102
1976	60.9630699157715
1977	60.3769989013672
1978	57.7101402282715
1979	53.8925399780273
1980	48.9894905090332
1981	46.4851608276367
1982	43.7994117736816
1983	42.2182502746582
1984	42.1392707824707
1985	43.1825218200684
1986	44.3807182312012
1987	46.5151214599609
1988	48.297290802002
1989	49.3412284851074
1990	50.4119110107422
1991	52.5387802124023
1992	54.7746696472168
1993	56.4894714355469
1994	57.1282615661621
1995	58.487060546875
1996	60.8832015991211
1997	62.6006507873535
1998	64.4972763061523
1999	65.9336013793945
2000	66.8737564086914
2001	68.9124526977539
2002	72.5404586791992
2003	72.5028381347656
2004	74.5214767456055
2005	76.7089996337891
2006	77.2046432495117
2007	81.1892318725586
2008	84.2198867797852
2009	88.0098571777344
2010	89.9011535644531
2011	91.0370864868164
2012	90.934211730957
2013	93.0093002319336
2014	92.0504608154297
2015	91.3197631835938
2016	90.7638702392578
2017	90.7288513183594
2018	91.4897766113281
2019	92.4362106323242
2020	93.0412673950195
2021	93.864631652832
2022	94.4485168457031