Year	% gross
1971	23.0967502593994
1972	22.760799407959
1973	21.779239654541
1974	21.0477409362793
1975	20.40797996521
1976	20.4073104858398
1977	21.0124206542969
1978	22.3999099731445
1979	23.5143795013428
1980	24.3228893280029
1981	24.8925800323486
1982	27.7236003875732
1983	31.1087093353271
1984	33.4801483154297
1985	35.7359085083008
1986	38.3534889221191
1987	37.689281463623
1988	38.464771270752
1989	41.2603492736816
1990	41.3785018920898
1991	41.6142997741699
1992	42.4967613220215
1993	45.2512893676758
1994	49.888069152832
1995	53.7420616149902
1996	57.6208114624023
1997	59.1375694274902
1998	65.3034133911133
1999	68.8061370849609
2000	70.8607177734375
2001	73.0169219970703
2002	74.8632202148438
2003	74.5205078125
2004	78.5067520141602
2005	81.5059814453125
2006	83.5737686157227
2007	86.7598495483398
2008	88.1069793701172
2009	86.0464019775391
2010	85.7978897094727
2011	87.7685089111328
2013	87.5095062255859
2014	85.8415222167969
2015	86.7649536132812
2016	91.1704330444336