Year	% gross
1971	40.490291595459
1972	45.2731018066406
1973	50.0777206420898
1974	55.2057991027832
1975	65.7167663574219
1976	69.5793075561523
1977	72.8393325805664
1978	77.3312835693359
1979	74.229850769043
1980	76.5827102661133
1981	59.2648010253906
1982	60.4977798461914
1983	61.6926803588867
1984	63.3172988891602
1985	63.3470115661621
1986	63.6709518432617
1987	63.8809585571289
1988	65.0778198242188
1989	65.6251373291016
1990	66.8449020385742
1991	65.7374114990234
1992	64.5782775878906
1993	58.6353302001953
1994	56.9074096679688
1998	51.1990394592285
1999	51.3158111572266
2000	52.0038299560547
2001	51.25830078125
2002	53.0296783447266
2003	75.8382568359375
2004	78.6036605834961
2005	82.7092514038086
2006	87.1978073120117
2007	92.3268127441406
2008	97.0034790039063
2009	100.433921813965
2010	99.0645980834961
2011	100.382438659668
2012	100.732223510742
2013	83.876579284668
2014	97.7106628417969
2015	84.5406265258789
2016	83.4155120849609
2017	84.7113723754883
2018	86.7533798217773
2019	87.504753112793
2020	85.8198318481445