Year	% gross
1970	15.2369604110718
1971	16.8809604644775
1972	17.8037204742432
1973	21.3673191070557
1974	24.8802700042725
1975	28.1677894592285
1976	27.9858207702637
1977	24.8506603240967
1978	21.0441093444824
1979	22.076150894165
1980	21.3328304290771
1981	21.4550800323486
1982	22.2198696136475
1983	22.8788509368896
1984	26.6121006011963
1985	33.3239784240723
1986	34.8167114257812
1987	36.3096885681152
1999	37.3416786193848
2000	42.2890205383301
2001	47.0956611633301
2002	49.6374015808105
2003	51.0838203430176
2004	53.3726081848145
2005	51.7212409973145
2006	53.0153388977051
2007	52.8379707336426
2008	54.2909088134766
2009	56.3224105834961
2010	58.8890419006348
2011	60.1936187744141
2012	60.758731842041
2013	60.1839714050293
2014	61.7789001464844
2015	63.3479804992676
2016	64.9077072143555
2017	66.6886520385742
2018	68.2028274536133
2019	70.5063400268555
2020	72.6504592895508
2021	75.4804534912109