Year	% gross
1970	46.5993003845215
1971	46.8049697875977
1972	47.4728317260742
1973	49.3596801757813
1974	52.0710296630859
1975	54.7074203491211
1976	57.0416412353516
1977	57.4701309204102
1978	57.4881782531738
1979	57.4383506774902
1980	58.3809013366699
1981	58.6767501831055
1982	59.3817405700684
1983	61.5895004272461
1984	63.6411514282227
1985	64.3279037475586
1986	65.9955215454102
1987	66.1626129150391
1988	65.8067169189453
1989	66.4055328369141
1990	67.6017913818359
1991	69.3352432250977
1992	70.1905670166016
1993	70.4852905273438
1994	71.27880859375
1995	71.3660583496094
1996	72.9319534301758
1997	72.7984008789063
1998	75.8034896850586
1999	76.1310501098633
2000	75.4884872436523
2001	76.9856414794922
2002	78.73095703125
2003	79.4079895019531
2004	78.4287261962891
2005	81.7789916992188
2006	79.3845062255859
2007	79.1457366943359
2008	79.2054061889648
2009	79.1177673339844
2010	80.7708969116211
2011	82.3572387695313
2012	83.5619277954102
2013	83.7555465698242
2014	81.9287567138672
2015	84.1391983032227
2016	85.5921096801758
2017	85.5731582641602
2018	85.495979309082
2019	85.3342590332031
2020	85.9225997924805