Year	% gross
1970	101.123931884766
1971	101.362480163574
1972	101.420532226562
1973	102.440826416016
1974	102.343948364258
1975	102.241897583008
1976	102.834762573242
1977	103.111419677734
1978	103.012626647949
1979	103.170509338379
1980	105.250526428223
1981	105.460411071777
1982	106.134590148926
1983	106.334373474121
1984	106.633476257324
1985	106.169486999512
1986	105.997833251953
1987	105.818946838379
1988	105.62922668457
1989	105.377059936523
1990	105.463409423828
1991	105.138328552246
1992	105.438453674316
1993	105.56282043457
1994	105.503532409668
1995	105.438529968262
1996	105.202713012695
1997	103.956672668457
1998	104.535713195801
1999	104.324012756348
2000	104.21305847168
2001	104.251731872559
2002	104.36402130127
2003	104.22779083252
2004	104.504302978516
2005	104.667289733887
2006	104.522987365723
2007	104.543502807617
2008	104.46272277832
2009	104.442398071289
2010	104.270469665527
2011	104.048057556152
2012	103.819381713867
2013	104.253120422363
2014	103.354522705078
2015	102.902976989746
2016	102.808441162109
2017	102.363426208496
2018	102.185852050781
2019	102.19938659668
2020	101.562622070312
2021	101.08512878418
2022	101.075828552246