Year	% gross
1971	109.954360961914
1972	104.223220825195
1973	100.170913696289
1974	100.165313720703
1975	100.385879516602
1976	99.7595977783203
1977	99.8787307739258
1978	99.9079132080078
1979	99.6344909667969
1980	99.6965179443359
1981	99.7174911499023
1982	99.7428588867188
1983	99.7355728149414
1984	99.6878662109375
1985	99.6227188110352
1986	99.6357116699219
1987	99.6360397338867
1988	99.4496917724609
1989	99.3185882568359
1990	99.4708633422852
1991	99.2500534057617
1992	99.2661514282227
1993	98.9951705932617
1994	98.8679580688477
1995	99.0194702148438
1996	99.2157516479492
1997	83.9077606201172
1998	99.2492980957031
1999	99.3142013549805
2000	99.2183685302734
2001	99.4430618286133
2002	99.4823684692383
2003	99.3606796264648
2004	99.5195388793945
2005	99.4460067749023
2006	99.6053009033203
2007	99.6532287597656
2008	99.8327331542969
2009	99.7181091308594
2010	99.6499176025391
2011	99.6951217651367
2012	99.8147506713867
2013	99.5960311889648
2014	99.4743194580078
2015	99.3415222167969
2016	99.2605514526367
2017	99.2646484375
2018	99.156379699707
2019	99.0888519287109
2020	98.9382705688477
2021	99.0479507446289