Year	% gross
1971	107.894432067871
1972	107.88362121582
1973	107.07723236084
1974	106.727752685547
1975	105.886016845703
1976	105.622413635254
1977	105.00520324707
1978	104.179489135742
1979	102.90160369873
1980	100.869247436523
1981	101.51692199707
1982	100.272819519043
1983	100.44953918457
1984	100.135223388672
1985	99.8338165283203
1986	99.0655822753906
1987	96.3087463378906
1988	97.2765808105469
1989	96.6648101806641
1990	95.8097381591797
1991	95.7289276123047
1992	95.7290725708008
1993	95.7065505981445
1994	96.3731689453125
1995	99.3103103637695
1996	97.1892623901367
1997	97.2734375
1998	98.9022674560547
1999	99.8783111572266
2000	100.908470153809
2001	100.593757629395
2002	102.311241149902
2003	102.259117126465
2004	102.688507080078
2005	102.069580078125
2006	101.388496398926
2007	99.9958114624023
2010	100.159591674805
2011	99.1419677734375
2012	99.1257476806641
2013	98.9525604248047
2014	98.1081314086914
2015	99.4775314331055
2016	98.7871170043945
2017	98.3973999023438
2018	97.63037109375
2019	97.7334518432617
2020	98.0997161865234
2021	98.5197219848633