Year	% gross
1970	104.029090881348
1971	103.950912475586
1972	103.817802429199
1973	103.682411193848
1974	103.566596984863
1975	103.150833129883
1976	103.450126647949
1977	102.658218383789
1978	102.198913574219
1979	101.797592163086
1980	101.58959197998
1981	101.249206542969
1982	101.625778198242
1983	101.877067565918
1984	102.57430267334
1985	102.734710693359
1986	103.04328918457
1987	103.346000671387
1988	103.573722839355
1989	103.009376525879
1990	102.953033447266
1991	103.162307739258
1992	102.690711975098
1993	102.482078552246
1994	102.085998535156
1995	101.28311920166
1996	100.981178283691
1997	101.100303649902
1998	102.391990661621
1999	102.84114074707
2000	103.042106628418
2001	104.098442077637
2002	104.7646484375
2003	103.670883178711
2004	103.050811767578
2005	102.000099182129
2006	101.680946350098
2007	101.48509979248
2008	101.166229248047
2009	100.854110717773
2010	100.990547180176
2011	101.008323669434
2012	101.052673339844
2013	102.349510192871
2014	101.428833007812
2015	100.775032043457
2016	100.516128540039
2017	100.14688873291
2018	100.641181945801
2019	101.009468078613
2020	100.42455291748
2021	100.948143005371
2022	100.818267822266