Year	% gross
1971	96.2832489013672
1972	95.6246795654297
1973	96.3511123657227
1974	98.3813323974609
1975	99.8887023925781
1976	102.726516723633
1977	101.041160583496
1978	100.893058776855
1979	100.533187866211
1980	101.20760345459
1981	99.2197265625
1982	99.2708511352539
1983	99.1004104614258
1984	99.1480712890625
1985	99.2858734130859
1986	99.3521423339844
1987	99.6569595336914
1988	100.048698425293
1989	100.166648864746
1990	99.936653137207
1991	99.9474182128906
1992	98.5873184204102
1993	98.8552169799805
1994	99.9268798828125
1995	99.3883285522461
1996	99.5582275390625
1998	99.7726211547852
1999	99.742919921875
2000	99.6710510253906
2001	99.7206420898438
2002	101.688171386719
2004	100
2005	98.2105865478516
2006	99.3460388183594
2007	100
2008	99.660270690918
2009	100.002456665039
2010	100.18155670166
2011	101.197456359863
2012	101.51065826416
2013	101.299331665039
2014	101.176940917969
2015	100.882141113281
2016	101.041496276855
2017	100.778030395508
2018	100.749008178711
2019	100.551002502441
2020	100.459587097168
2021	100.308418273926
2022	100.244453430176