Year	% gross
1971	107.208168029785
1972	106.772399902344
1973	102.257530212402
1974	104.545516967773
1975	104.699012756348
1976	105.382720947266
1977	105.487716674805
1978	104.823226928711
1979	104.096138000488
1980	103.880081176758
1981	103.720252990723
1982	103.974647521973
1983	101.935333251953
1984	101.82048034668
1985	101.098388671875
1986	100.605911254883
1987	100.421142578125
1988	99.9678497314453
1989	99.5748672485352
1990	99.3014297485352
1991	99.6800994873047
1992	99.3220977783203
1993	102.702980041504
1994	102.863807678223
1995	102.981170654297
1996	102.848442077637
1999	101.366653442383
2000	102.427947998047
2001	102.994300842285
2002	103.187858581543
2003	103.294708251953
2004	102.853469848633
2005	102.971160888672
2006	102.635482788086
2007	102.348220825195
2008	102.16187286377
2009	102.13809967041
2010	102.102478027344
2011	101.12109375
2012	101.331756591797
2013	103.259292602539
2014	103.175552368164
2015	102.323287963867
2016	102.172943115234
2017	102.819320678711
2018	102.566162109375
2019	102.284622192383
2020	102.151741027832
2021	101.836441040039