Year	% gross
1971	97.0899963378906
1972	96.4108963012695
1973	97.058708190918
1974	99.0420913696289
1975	101.188583374023
1976	102.050880432129
1977	102.086456298828
1978	101.869018554688
1979	101.830192565918
1980	101.127838134766
1981	99.1593170166016
1982	99.3067016601562
1983	99.2668914794922
1984	99.1888580322266
1985	99.5814666748047
1986	99.2927322387695
1987	99.6864318847656
1988	100.082931518555
1989	100.186256408691
1990	99.9988327026367
1991	100.036628723145
1992	98.658073425293
1993	99.0048904418945
1994	100.160842895508
1995	99.8836288452148
1996	99.5259475708008
1998	99.7676696777344
1999	99.697883605957
2000	99.6714096069336
2001	99.7190093994141
2002	101.688758850098
2004	100
2005	98.2333679199219
2006	99.4166870117188
2007	100
2008	99.9287414550781
2009	100.060958862305
2010	100.238670349121
2011	100.904838562012
2012	101.018173217773
2013	100.825370788574
2014	100.685890197754
2015	100.352981567383
2016	100.48494720459
2017	100.303398132324
2018	100.362777709961
2019	100.236633300781
2020	100.159637451172
2021	100.031097412109
2022	99.9220428466797