Year	% gross
1971	2.38775992393494
1976	2.86681008338928
1977	3.08246994018555
1978	3.40920996665955
1979	3.68522000312805
1980	9.84696006774902
1981	13.1678600311279
1982	13.8031597137451
1983	15.3194904327393
1984	15.9371299743652
1985	17.2169704437256
1986	17.215539932251
1987	17.3304290771484
1988	17.3516502380371
1989	18.3024997711182
1990	17.9586200714111
1991	17.735279083252
1992	16.5075492858887
1999	7.79191017150879
2000	9.80387020111084
2001	10.3802099227905
2002	11.6092700958252
2003	14.0021696090698
2004	15.9449996948242
2005	17.4540004730225
2006	19.1694793701172
2007	21.5541400909424
2008	23.1303901672363
2009	26.8147106170654
2010	31.3608798980713
2011	34.5993309020996
2012	36.7690505981445
2013	39.2507286071777
2014	38.3135604858398
2015	36.1665306091309
2016	35.0502700805664
2017	35.615779876709
2018	36.856071472168
2019	39.3624687194824
2021	39.4191093444824
2022	38.2957801818848