Year	% gross
1971	114.32576751709
1972	117.151138305664
1973	120.5537109375
1974	120.980407714844
1975	120.55867767334
1976	119.703750610352
1977	116.502922058105
1978	112.919799804688
1979	109.820182800293
1980	106.411849975586
1981	104.081016540527
1982	103.947212219238
1983	105.717842102051
1984	106.528511047363
1985	104.280548095703
1986	103.48770904541
1987	103.362579345703
1988	103.21533203125
1989	102.227203369141
1990	101.424186706543
1991	100.831260681152
1992	102.467582702637
1993	101.849006652832
1994	101.793487548828
1995	101.242889404297
1996	104.105628967285
1997	104.264778137207
1998	102.583381652832
1999	103.199821472168
2000	102.491340637207
2001	101.88591003418
2002	102.176742553711
2003	100.977828979492
2004	101.251472473145
2005	101.384239196777
2006	101.467292785645
2007	100.794242858887
2008	99.8368835449219
2009	100.067077636719
2010	99.5523834228516
2011	99.0222625732422
2012	99.568962097168
2013	99.6836700439453
2014	100.181098937988
2015	99.8312301635742
2016	99.9107131958008
2017	99.2173690795898
2018	98.8986511230469
2019	99.2798614501953
2020	99.744758605957
2021	99.8292007446289
2022	99.1484680175781