Year	% gross
1970	23.821460723877
1971	24.2183895111084
1972	24.6947002410889
1973	25.2508506774902
1974	25.8646507263184
1975	26.752420425415
1976	27.242359161377
1977	27.5028495788574
1978	28.0735092163086
1979	27.9489192962646
1980	29.8251991271973
1981	31.0131893157959
1982	32.7090797424316
1983	36.3357887268066
1984	39.483039855957
1985	39.547119140625
1986	37.3701286315918
1987	37.3550910949707
1988	36.6907386779785
1989	36.1065788269043
1990	36.1465911865234
1991	37.2382507324219
1992	38.0904502868652
1993	37.1123886108398
1994	36.3455581665039
1995	35.7176895141602
1996	34.8225212097168
1997	34.099910736084
1998	33.4885292053223
1999	32.7609100341797
2000	33.2183799743652
2001	34.178108215332
2002	35.0242309570312
2003	35.383228302002
2004	37.469310760498
2005	37.3703994750977
2006	39.5701103210449
2007	40.8261489868164
2008	42.0688209533691
2009	42.9538993835449
2010	44.9947700500488
2011	46.2199287414551
2012	47.125301361084
2013	50.3977394104004
2014	47.4011917114258
2015	48.5914001464844
2016	47.6150894165039
2017	47.2868995666504
2018	47.7682800292969
2019	48.9026184082031
2020	48.9771499633789
2021	49.0530014038086
2022	49.2219886779785