Year	% gross
1971	10.8467502593994
1972	13.648380279541
1973	13.3187799453735
1974	13.3705596923828
1975	14.9751796722412
1976	16.3744201660156
1977	23.7650508880615
1978	17.8687801361084
1979	18.7950191497803
1980	21.3592205047607
1981	22.2530498504639
1982	25.3593406677246
1983	22.7021903991699
1984	23.0300407409668
1985	21.2344398498535
1986	17.927619934082
1987	15.0743703842163
1988	15.912389755249
1989	17.0870704650879
1990	17.8111190795898
1991	15.8918399810791
1992	17.1099700927734
1993	17.8374404907227
1994	22.0588207244873
1995	22.2780609130859
1996	21.6014499664307
1997	25.4725494384766
1998	26.5149402618408
1999	26.1038208007813
2000	27.6176490783691
2001	28.2834091186523
2002	32.5728416442871
2003	33.6680603027344
2004	33.9897689819336
2005	37.3271102905273
2006	40.9095802307129
2007	43.432071685791
2008	51.945499420166
2009	53.5837097167969
2011	56.0357818603516
2013	52.4669914245605
2014	55.4935188293457
2015	58.6540908813477
2016	60.3875198364258
2017	61.0043983459473
2018	60.6423301696777
2019	60.5426788330078
2020	62.6025581359863
2021	54.1719703674316