Year	% gross
1971	31.8371391296387
1972	33.4687194824219
1973	35.8256912231445
1974	39.4295616149902
1975	44.3370590209961
1976	49.6465301513672
1977	54.8614196777344
1978	60.2305297851562
1979	65.4482727050781
1980	69.4152679443359
1981	71.9066162109375
1982	74.7321319580078
1983	75.918701171875
1984	77.2089233398438
1985	79.4679794311523
1986	78.2713623046875
1987	77.0804672241211
1988	77.066520690918
1989	75.0853500366211
1990	74.7505187988281
1991	76.9700469970703
1992	81.9008178710938
1993	83.326286315918
1994	85.2307586669922
1996	88.4512023925781
1999	89.691650390625
2000	88.2968597412109
2002	87.3971481323242
2003	86.4371185302734
2004	84.3984603881836
2005	83.5588531494141
2006	84.5072784423828
2007	78.0859527587891
2008	79.3615188598633
2010	77.3642730712891
2011	77.3388137817383
2012	77.0714263916016
2013	79.3827133178711
2014	75.1034622192383
2017	64.3706436157227
2018	64.7993469238281
2019	66.5335083007812
2020	67.9437713623047
2021	70.0691375732422
2022	70.9684371948242