Year	% gross
1971	104.849479675293
1972	104.241157531738
1973	100.010398864746
1974	100.003410339355
1975	100.252861022949
1976	99.5796127319336
1977	99.7374420166016
1978	99.8147964477539
1979	99.6182632446289
1980	99.6423568725586
1981	99.6620788574219
1982	99.7353210449219
1983	99.7332077026367
1984	99.6714172363281
1985	99.6785583496094
1986	99.734733581543
1987	99.6138763427734
1988	99.4862976074219
1989	99.4103164672852
1990	99.3974075317383
1991	99.2064895629883
1992	99.1936264038086
1993	98.7480697631836
1994	98.7121429443359
1995	98.9845123291016
1996	99.172607421875
1997	83.8391876220703
1998	99.119743347168
1999	99.2864685058594
2000	99.1401519775391
2001	99.3257598876953
2002	99.3154602050781
2003	99.2785110473633
2004	99.3458099365234
2005	99.2598037719727
2006	99.3583068847656
2007	99.5711975097656
2008	99.708251953125
2009	99.7100524902344
2010	99.6255111694336
2011	99.6926803588867
2012	99.6305236816406
2013	99.6445617675781
2014	99.4921569824219
2015	99.3550262451172
2016	99.2261276245117
2017	99.2714920043945
2018	99.1744232177734
2019	99.0806503295898
2020	98.8857498168945
2021	98.9731903076172