Year	% gross
1976	15.2155103683472
1977	15.2298803329468
1978	15.4706602096558
1979	15.6246299743652
1980	15.711799621582
1981	15.6833000183105
1982	15.5097904205322
1983	15.3819599151611
1984	15.2612800598145
1985	15.1875295639038
1986	15.4205598831177
1987	15.3535995483398
1988	15.4683504104614
1989	15.6045598983765
1990	15.5892095565796
1991	15.5960397720337
1992	15.632209777832
1993	15.5388402938843
1994	15.2533702850342
1995	15.2531604766846
1996	15.3177299499512
1997	15.1197204589844
1998	15.0578098297119
1999	13.6117496490479
2000	14.4678001403809
2001	15.1173400878906
2002	16.6215801239014
2003	18.1851806640625
2004	19.8578491210938
2005	20.8167591094971
2006	21.9856491088867
2007	19.871129989624
2008	19.1990795135498
2009	20.2829895019531
2010	20.481409072876
2011	22.7195796966553
2012	24.8248291015625
2013	27.3776092529297
2014	20.3320999145508
2015	21.6769504547119
2016	23.0415000915527
2017	23.4483108520508
2018	23.3562297821045
2019	23.450870513916
2020	24.1383800506592