Year	% gross
1971	114.55818939209
1972	117.917503356934
1973	121.706268310547
1974	122.270248413086
1975	122.263008117676
1976	121.66340637207
1977	118.753021240234
1978	115.784156799316
1979	112.539581298828
1980	109.289123535156
1981	106.362922668457
1982	106.156196594238
1983	108.168769836426
1984	108.775260925293
1985	107.317138671875
1986	106.367347717285
1987	106.260643005371
1988	106.137390136719
1989	104.556549072266
1990	103.00341796875
1991	101.816612243652
1992	102.569458007812
1993	101.748908996582
1994	101.411468505859
1995	100.743759155273
1996	104.993927001953
1997	105.26969909668
1998	103.875671386719
1999	104.370643615723
2000	103.97191619873
2001	103.602836608887
2002	104.073417663574
2003	102.926849365234
2004	103.295028686523
2005	103.178070068359
2006	102.90535736084
2007	102.05394744873
2008	100.851768493652
2009	101.104316711426
2010	100.690048217773
2011	100.203720092773
2012	100.628433227539
2013	100.505249023438
2014	102.776878356934
2015	102.812782287598
2016	102.451210021973
2017	101.847290039062
2018	101.155838012695
2019	100.981201171875
2020	101.090461730957
2021	100.468193054199
2022	99.8729629516602