Year	% gross
1971	37.1225395202637
1972	39.2037582397461
1973	44.6941184997559
1974	50.0322608947754
1975	53.3542098999023
1976	53.363338470459
1977	55.0854911804199
1978	56.0537986755371
1979	55.918529510498
1980	56.6994590759277
1981	55.9561882019043
1982	52.1581382751465
1983	50.0687713623047
1984	47.4299507141113
1985	48.5408096313477
1986	50.4651718139648
1987	51.6596298217773
1988	51.7715911865234
1989	51.0475311279297
1990	49.334041595459
1991	46.8963203430176
1992	43.4781494140625
1993	42.187198638916
1994	42.8800888061523
1995	44.6660385131836
1996	45.6917381286621
1997	46.7789192199707
1998	47.5049896240234
1999	47.4039688110352
2000	47.2366218566895
2001	47.3684616088867
2002	47.6610298156738
2003	49.8365287780762
2004	52.0991897583008
2005	54.2352409362793
2006	56.6333503723145
2007	59.5306701660156
2008	60.9560203552246
2009	64.4306793212891
2010	69.0793380737305
2011	72.6559066772461
2012	77.0856475830078
2013	77.6602478027344
2014	79.9119567871094
2015	75.763313293457
2016	69.8367233276367
2017	81.1445465087891
2018	87.7938537597656
2019	92.9353713989258
2020	93.8656768798828