Year	% gross
1970	100.199417114258
1971	100.293060302734
1972	100.287712097168
1973	101.476577758789
1974	100.824020385742
1975	100.94255065918
1976	101.420928955078
1977	100.736808776855
1978	100.47306060791
1979	99.6945877075195
1980	102.249786376953
1981	102.175468444824
1982	103.162162780762
1983	103.119972229004
1984	103.254707336426
1985	103.172286987305
1986	103.211761474609
1987	102.981552124023
1988	103.072341918945
1989	103.228309631348
1990	103.656799316406
1991	103.424026489258
1992	103.54638671875
1993	103.794448852539
1994	104.14875793457
1995	104.077377319336
1996	103.573707580566
1997	103.159637451172
1998	103.429649353027
1999	103.211608886719
2000	102.795486450195
2001	102.923568725586
2002	102.94213104248
2003	102.134971618652
2004	102.265342712402
2005	102.59854888916
2006	102.257583618164
2007	102.090263366699
2008	101.988960266113
2009	101.709197998047
2010	101.329627990723
2011	101.056541442871
2012	100.977272033691
2013	101.098739624023
2014	100.682258605957
2015	100.686943054199
2016	100.840606689453
2017	100.912406921387
2018	100.839111328125
2019	101.030639648438
2020	100.525146484375
2021	99.8449783325195
2022	99.8786926269531