Year	% gross
1971	8.37788963317871
1972	9.22852039337158
1973	10.1902198791504
1974	10.9101600646973
1975	11.9918899536133
1976	13.1197900772095
1977	14.4303903579712
1978	15.5791501998901
1979	16.2815494537354
1980	16.8431205749512
1981	17.777229309082
1982	18.2335605621338
1983	19.5922908782959
1984	20.5301303863525
1985	21.9498691558838
1986	22.1981506347656
1987	24.1734504699707
1988	25.2070598602295
1989	25.7296104431152
1990	25.9046897888184
1991	27.4238605499268
1992	28.3093795776367
1994	27.0932693481445
1995	26.0642795562744
1997	24.2727298736572
1998	25.0927505493164
1999	26.5437793731689
2000	27.9761600494385
2001	32.9529800415039
2002	28.7471904754639
2003	30.2879791259766
2004	26.9293994903564
2005	27.413049697876
2006	23.8881702423096
2007	32.7429504394531
2008	37.0601005554199
2009	40.9297409057617
2010	44.0400009155273
2011	48.9704093933105
2012	52.1736297607422
2013	53.9815216064453
2014	58.1796493530273
2015	59.5547103881836
2016	60.4655914306641
2017	50.6370010375977
2018	46.4729995727539
2019	44.4230003356934
2020	45.2589988708496
2021	45.0281105041504
2022	45.143669128418