Year	% gross
1970	18.5385093688965
1971	19.4351005554199
1972	20.790599822998
1973	20.5964298248291
1974	21.7394695281982
1975	23.5457096099854
1977	30.609769821167
1979	27.481840133667
1980	33.7751312255859
1982	30.6275405883789
1983	33.5230293273926
1984	27.2769794464111
1985	18.518440246582
1986	20.8306102752686
1987	23.3055000305176
1988	23.1990604400635
1989	23.7840900421143
1998	42.821891784668
1999	47.5217895507812
2000	49.2735786437988
2001	51.9387588500977
2002	56.0747299194336
2004	60.983570098877
2005	63.6843185424805
2006	63.0116996765137
2007	65.5784530639648
2008	63.8044815063477
2010	65.1287078857422