Year	% gross
1971	19.4326591491699
1972	21.6795196533203
1973	23.7353801727295
1974	25.7137203216553
1975	27.21116065979
1976	28.8786602020264
1977	30.5065898895264
1978	32.2667007446289
1979	34.1216888427734
1980	34.6001586914062
1981	34.7488288879395
1982	35.3884391784668
1983	37.194938659668
1984	39.7553405761719
1985	42.2190589904785
1986	44.194019317627
1987	44.8815307617188
1988	44.5560989379883
1989	43.5742683410645
1990	42.3045883178711
1991	40.7385215759277
1992	39.7326202392578
1993	40.2725410461426
1994	39.6189918518066
1995	39.3847885131836
1996	39.682861328125
1997	40.2977409362793
1998	41.1196708679199
1999	41.736400604248
2000	42.3653907775879
2001	43.2514190673828
2002	44.9316787719727
2003	60.2354507446289
2004	63.4802017211914
2005	66.9490432739258
2006	68.8510131835938
2007	70.178466796875
2008	70.8747329711914
2009	72.4899215698242
2010	73.5013198852539
2011	74.7401809692383
2012	75.3832321166992
2013	48.6883201599121
2020	39.7803916931152
2021	40.0097198486328
2022	40.8394393920898
2023	41.1286201477051