Year	% gross
1971	101.269416809082
1972	105.711242675781
1973	106.054252624512
1974	107.514686584473
1975	107.145042419434
1976	89.9002304077148
1977	93.1230773925781
1978	94.3702392578125
1979	97.08447265625
1980	98.3180389404297
1981	99.5930480957031
1982	100.319610595703
1983	101.554733276367
1984	105.239967346191
1985	106.819892883301
1986	108.28182220459
1987	109.558166503906
1988	110.987289428711
1989	111.688720703125
1990	113.078971862793
1991	113.864410400391
1992	116.974082946777
1993	113.945106506348
1994	116.124557495117
1995	116.060340881348
1996	117.399612426758
1997	119.055976867676
1998	118.430450439453
1999	121.148979187012
2000	125.493049621582
2001	128.174865722656
2002	129.487838745117
2003	132.235412597656
2004	110.782669067383
2005	111.326103210449
2006	110.277038574219
2007	109.042900085449
2008	108.298301696777
2009	107.702293395996
2010	108.609390258789
2011	109.248931884766
2012	109.962677001953
2013	145.653442382812
2014	147.413314819336
2015	150.819213867188
2016	152.471435546875
2017	153.583709716797
2018	153.651428222656
2019	144.613204956055
2020	143.122909545898
2021	143.361343383789
2022	144.852462768555