Year	% gross
1970	104.524230957031
1971	105.013130187988
1972	107.029426574707
1973	107.272773742676
1974	107.530532836914
1975	109.118782043457
1976	108.148307800293
1977	109.501159667969
1978	110.957092285156
1979	106.79305267334
1980	106.923210144043
1981	112.548286437988
1982	112.538200378418
1983	111.435836791992
1984	105.283172607422
1985	106.012817382812
1986	106.457473754883
1987	104.776863098145
1988	102.003158569336
1989	101.674057006836
1990	103.530822753906
1991	104.641159057617
1992	103.452728271484
1993	102.565299987793
1994	101.832153320312
1995	101.603897094727
1996	101.571807861328
1997	101.940010070801
1998	102.316741943359
1999	102.774757385254
2000	103.859893798828
2001	104.010391235352
2002	104.405410766602
2003	104.591453552246
2004	104.295738220215
2005	103.417343139648
2006	102.592987060547
2007	101.439422607422
2008	101.416160583496
2009	101.013366699219
2010	101.202201843262
2011	101.495300292969
2012	102.137413024902
2013	100.655059814453
2014	100.97289276123
2015	101.028846740723
2016	100.95140838623
2017	100.050567626953
2018	99.7773895263672
2019	98.7092819213867
2020	97.9685363769531
2021	102.881149291992