Year	% gross
1971	113.123748779297
1972	117.576309204102
1973	110.758682250977
1974	111.55322265625
1975	112.579566955566
1976	112.173599243164
1977	111.161056518555
1978	110.34676361084
1979	110.35765838623
1980	110.203712463379
1981	109.650421142578
1982	109.511131286621
1983	109.228019714355
1984	108.924873352051
1985	108.889030456543
1986	108.404991149902
1987	109.99893951416
1988	108.278312683105
1989	108.598106384277
1990	108.407989501953
1991	108.766662597656
1992	106.993263244629
1993	108.051330566406
1994	107.662811279297
1995	106.833770751953
1996	106.093688964844
1997	105.399978637695
1998	104.691047668457
1999	103.661277770996
2000	103.699768066406
2001	103.985786437988
2002	104.826637268066
2003	104.485313415527
2004	104.33544921875
2005	103.636978149414
2006	102.832588195801
2007	102.389038085938
2008	101.865432739258
2009	101.699363708496
2010	100.903877258301
2011	100.534408569336
2012	100.174942016602
2013	103.610656738281
2014	103.173980712891
2015	102.87133026123
2016	102.916732788086
2017	103.301422119141
2018	103.321517944336
2019	103.812759399414
2020	103.888252258301
2021	103.133712768555