Year	% gross
1971	4.29618978500366
1972	6.36851978302002
1973	8.56902980804443
1974	9.12119960784912
1975	11.0382099151611
1977	15.9390897750854
1979	17.3598804473877
1980	17.5666694641113
1981	16.4948101043701
1982	15.6487903594971
1983	15.1228504180908
1984	15.8450698852539
1985	16.463529586792
1986	17.8061103820801
1987	18.8151206970215
1988	19.0875091552734
1989	17.7479496002197
1990	17.08131980896
1991	17.3032703399658
1992	16.0359191894531
1993	14.7781600952148
1994	14.0463800430298
1995	11.5891399383545
1996	10.5577697753906
1997	10.3253698348999
1998	10.326470375061
1999	19.2639999389648
2000	20.7964000701904
2001	24.2439193725586
2002	24.30126953125
2003	27.7520999908447
2004	38.4735984802246
2005	44.3712196350098
2006	64.8045425415039
2007	74.6545867919922
2008	88.3314971923828
2009	86.0132675170898
2010	71.216438293457
2011	59.8936500549316
2012	48.8004608154297
2013	36.253231048584
2015	30.3664398193359
2016	28.9170894622803
2017	30.4006500244141
2018	32.4025993347168
2019	33.2966995239258
2020	32.7164306640625
2021	36.0344696044922