Year	% gross
1970	95.2350006103516
1971	94.7810287475586
1972	96.0210037231445
1973	96.8756332397461
1974	98.7210388183594
1975	99.0849533081055
1976	99.6958084106445
1977	100.310173034668
1978	100.327056884766
1979	99.6899566650391
1980	99.5522003173828
1981	100.012161254883
1982	100.508911132812
1983	100.615303039551
1984	100.419700622559
1985	100.464393615723
1986	99.7849731445312
1987	100.109153747559
1988	99.7955169677734
1989	99.5988998413086
1990	98.0145874023438
1991	97.9935989379883
1992	97.4106674194336
1993	97.4276275634766
1994	98.3963165283203
1995	98.7066497802734
1996	98.1784133911133
1997	98.351676940918
1998	98.8582000732422
1999	98.0927581787109
2000	99.9417419433594
2001	100.74813079834
2002	101.194290161133
2003	101.950637817383
2004	102.673240661621
2005	103.050689697266
2006	103.998222351074
2007	103.581192016602
2008	104.515129089355
2009	104.474700927734
2010	104.609069824219
2011	104.48616027832
2012	104.427841186523
2013	103.946823120117
2014	103.466110229492
2015	103.182983398438
2016	102.963371276855
2017	103.041870117188
2018	103.101020812988
2019	103.04670715332
2020	102.94246673584
2021	102.412322998047
2022	102.560539245605