Year	% gross
1971	98.8827209472656
1972	99.4563217163086
1973	98.9884719848633
1974	98.9706878662109
1975	98.9814300537109
1976	98.9728698730469
1977	99.6005325317383
1983	99.5907287597656
1984	99.2892303466797
1986	99.535270690918
1987	98.9749526977539
1988	99.2730178833008
1989	100.265022277832
1993	99.1824264526367
1994	99.5279388427734
1995	99.5506896972656
1996	99.9929962158203
1997	99.1219024658203
1998	98.4571304321289
1999	98.1803512573242
2000	98.3597030639648
2001	98.5811080932617
2002	98.1123580932617
2003	98.2024383544922
2004	98.4233322143555
2005	98.3262786865234
2006	98.1098327636719
2007	98.47119140625
2008	98.3673477172852
2009	98.3046264648438
2010	98.8468322753906
2011	98.6746368408203
2012	98.7943572998047
2013	98.7074813842773
2014	98.6835021972656
2015	98.8649215698242
2016	99.1134262084961
2017	98.867317199707
2018	98.6988525390625
2019	98.9393997192383
2020	98.5123291015625
2021	98.6202697753906