Year	% gross
1970	93.1495513916016
1971	93.1600112915039
1972	92.7677917480469
1973	95.3977966308594
1974	95.0186996459961
1975	94.9648818969727
1976	95.0993270874023
1977	94.6077270507812
1978	94.1215591430664
1979	93.3543395996094
1980	101.040397644043
1981	101.014793395996
1982	103.98860168457
1983	104.009017944336
1984	103.491409301758
1985	102.954582214355
1986	103.102043151855
1987	103.165557861328
1988	103.856086730957
1989	104.561218261719
1990	105.233108520508
1991	104.349937438965
1992	104.30541229248
1993	104.24259185791
1994	104.086097717285
1995	104.951843261719
1996	103.924270629883
1997	102.877571105957
1998	101.830909729004
1999	101.14949798584
2000	101.28751373291
2001	101.360557556152
2002	101.433471679688
2003	101.506538391113
2004	101.580680847168
2005	101.580657958984
2006	101.412338256836
2007	101.119171142578
2008	100.765716552734
2009	100.575942993164
2010	100.261222839355
2011	99.9384536743164
2012	99.7327270507812
2013	99.4475936889648
2014	99.6594161987305
2015	100.261497497559
2016	101.118423461914
2017	101.552520751953
2018	101.056541442871
2019	100.690933227539
2020	100.069297790527
2021	98.1203765869141
2022	98.1231002807617