Year	% gross
1971	40.250919342041
1973	36.3261108398438
1974	33.765209197998
1975	32.3643608093262
1976	32.0933494567871
1977	31.9441509246826
1978	31.9407806396484
1979	32.4615898132324
1980	34.4156303405762
1981	35.7212982177734
1982	35.3667907714844
1983	36.7595710754395
1984	37.8424301147461
1985	37.1089897155762
1986	37.5895614624023
1987	37.2651596069336
1988	38.9332809448242
1989	34.5254707336426
1990	34.4605407714844
1995	31.6076793670654
1999	30.7412605285645
2000	31.1098403930664
2001	29.8333206176758
2002	31.3325805664062
2003	32.9367294311523
2004	35.5564308166504
2005	37.7072486877441
2006	39.6188697814941
2007	43.752498626709
2008	46.2536888122559
2009	48.2707595825195
2011	56.131519317627
2012	57.2292594909668
2013	68.5841217041016
2014	64.1842880249023
2015	67.1027984619141
2016	67.1578903198242
2017	66.3819198608398
2018	67.7538223266602
2019	70.6078872680664
2020	73.2740478515625
2021	75.3132629394531
2022	76.7830963134766