Year	% gross
1970	104.185859680176
1971	104.099052429199
1972	103.502136230469
1973	103.67138671875
1974	103.900833129883
1975	102.810691833496
1976	102.820091247559
1977	102.448173522949
1978	101.517189025879
1979	101.130348205566
1980	100.863403320312
1981	100.773849487305
1982	101.371513366699
1983	101.873931884766
1984	103.346801757812
1985	103.672912597656
1986	104.229873657227
1987	104.716018676758
1988	105.622749328613
1989	104.754211425781
1990	104.788543701172
1991	105.207046508789
1992	103.837837219238
1993	102.815536499023
1994	101.847457885742
1995	100.827293395996
1996	100.41039276123
1997	101.32804107666
1998	102.97811126709
1999	103.913719177246
2000	104.861068725586
2001	106.622550964355
2002	108.100479125977
2003	105.80549621582
2004	103.782783508301
2005	101.163078308105
2006	100.598686218262
2007	100.432258605957
2008	99.3568267822266
2009	98.9425201416016
2010	99.4166412353516
2011	99.628532409668
2012	99.6829299926758
2013	101.344306945801
2014	100.936660766602
2015	99.8970108032227
2016	99.4081420898438
2017	98.5715484619141
2018	99.6356201171875
2019	100.247299194336
2020	99.3822326660156
2021	99.8551635742188
2022	99.5982894897461