Year	% gross
1971	39.8332710266113
1972	43.0216789245605
1973	45.8158683776855
1974	49.5000686645508
1975	52.2041091918945
1976	55.2304916381836
1977	59.6675491333008
1978	64.0859298706055
1979	69.1091232299805
1980	75.9026718139648
1981	81.6750106811523
1982	82.0337600708008
1983	82.9063415527344
1984	86.0946426391602
1985	86.6791610717773
1986	87.392951965332
1987	89.5768966674805
1988	89.4224624633789
1989	90.9010314941406
1990	91.1876220703125
1991	91.1681671142578
1992	90.6418685913086
1993	91.9217071533203
1994	94.2984085083008
1995	95.4318008422852
1996	97.4143295288086
1997	95.7458724975586
1998	95.1108779907227
1999	96.0229034423828
2000	98.0937805175781
2001	97.6082382202148
2002	97.2662963867188
2003	96.9660186767578
2004	96.9991989135742
2005	97.2146224975586
2006	96.7785415649414
2007	96.7113800048828
2008	96.3489303588867
2009	96.8854293823242
2010	97.2930603027344
2011	97.5294189453125
2012	97.3674163818359
2013	97.8287506103516
2014	98.5806732177734
2015	98.5931930541992
2016	98.7179565429688
2017	99.105583190918
2018	99.3186569213867
2019	98.3813018798828
2020	97.0888214111328
2021	98.0951538085938
2022	97.9161987304688