Year	% gross
1971	99.384147644043
1972	98.1353912353516
1973	98.8177871704102
1974	99.4516677856445
1975	97.2931671142578
1976	100.059226989746
1977	100.44847869873
1978	98.3586502075195
1979	97.8495483398438
1981	98.6775283813477
1982	100.552360534668
1983	101.559478759766
1984	107.771339416504
1985	106.507766723633
1986	106.573150634766
1987	106.081466674805
1988	108.065803527832
1989	105.281616210938
1990	105.998336791992
1991	105.850738525391
1992	105.769638061523
1993	102.841171264648
1994	99.7696990966797
1995	98.5700378417969
1997	97.3193206787109
1999	100.584457397461
2000	105.348022460938
2001	107.175216674805
2002	107.681411743164
2003	104.261337280273
2004	104.270729064941
2005	104.605560302734
2006	104.943740844727
2007	105.445426940918
2008	102.862808227539
2009	101.92414855957
2010	104.570068359375
2011	105.751289367676
2012	104.708396911621
2013	114.724349975586
2014	111.935722351074
2015	107.29418182373
2016	105.28328704834
2017	97.4918975830078
2018	100.931251525879
2019	103.962959289551
2020	103.296417236328
2021	102.596397399902