Year	% gross
1970	106.870048522949
1971	106.826599121094
1972	106.72412109375
1973	105.323440551758
1974	105.551071166992
1975	105.31413269043
1976	105.233909606934
1977	104.869270324707
1978	104.497360229492
1979	103.905082702637
1980	103.328201293945
1981	102.696220397949
1982	102.815849304199
1983	102.744758605957
1984	102.740417480469
1985	102.951881408691
1986	103.085792541504
1987	103.191429138184
1988	102.869499206543
1989	102.444686889648
1990	101.863967895508
1991	101.353897094727
1992	101.657722473145
1993	102.671081542969
1994	103.344718933105
1995	103.157188415527
1996	103.565780639648
1997	103.177017211914
1998	104.364700317383
1999	104.172088623047
2000	103.181976318359
2001	103.521171569824
2002	103.508651733398
2003	103.330436706543
2004	103.140731811523
2005	103.608673095703
2006	103.432891845703
2007	103.133560180664
2008	102.73999786377
2009	102.32723236084
2010	101.991432189941
2011	101.763656616211
2012	101.656959533691
2013	102.288238525391
2014	101.602699279785
2015	101.419921875
2016	101.031051635742
2017	101.41040802002
2018	101.392646789551
2019	101.464317321777
2020	100.774787902832
2021	101.317756652832
2022	101.298767089844