Year	% gross
1971	101.332443237305
1972	111.760780334473
1973	111.981338500977
1974	115.845039367676
1975	117.185157775879
1976	121.628837585449
1977	126.432929992676
1978	128.030944824219
1979	130.471923828125
1980	127.830070495605
1981	126.15242767334
1982	127.212173461914
1983	126.947319030762
1984	125.47087097168
1985	126.964889526367
1986	123.169227600098
1987	120.794776916504
1988	119.800628662109
1989	119.701202392578
1990	121.320640563965
1991	121.435050964355
1992	119.586608886719
1993	119.986297607422
1997	122.225738525391
1999	102.95108795166
2000	104.620407104492
2001	105.59619140625
2002	105.267242431641
2003	103.646202087402
2004	101.481216430664
2005	101.704696655273
2006	103.926887512207
2007	99.860221862793
2008	99.4006805419922
2009	99.2877883911133
2010	98.3664169311523
2011	98.2329864501953
2012	96.8773880004883
2013	96.9970626831055
2014	96.8092498779297
2015	95.5096817016602
2016	95.8178634643555
2017	97.0577392578125
2018	99.3566284179688
2019	100.437072753906
2020	101.071899414062
2021	101.944000244141
2022	104.640998840332