Year	% gross
1970	103.109733581543
1971	103.041091918945
1972	102.503150939941
1973	103.154342651367
1974	103.271347045898
1975	102.19123840332
1976	102.380416870117
1977	102.073516845703
1978	101.196128845215
1979	101.112731933594
1980	101.150398254395
1981	101.298439025879
1982	101.994163513184
1983	102.650367736816
1984	104.496047973633
1985	104.867576599121
1986	105.515350341797
1987	106.10619354248
1988	107.273941040039
1989	106.392463684082
1990	106.53929901123
1991	107.339996337891
1992	105.568252563477
1993	104.013618469238
1994	102.785598754883
1995	101.585258483887
1996	100.804557800293
1997	101.607727050781
1998	103.261932373047
1999	104.44686126709
2000	105.65128326416
2001	107.617958068848
2002	109.451042175293
2003	106.799713134766
2004	104.240859985352
2005	101.284439086914
2006	100.684577941895
2007	100.623901367188
2008	99.5362014770508
2009	98.9750595092773
2010	99.4943008422852
2011	99.7329635620117
2012	99.7258071899414
2013	101.921836853027
2014	101.619331359863
2015	100.589141845703
2016	100.145668029785
2017	99.2322311401367
2018	100.608093261719
2019	101.193916320801
2020	100.916748046875
2021	100.532829284668
2022	100.247848510742