Year	% gross
1970	12.203929901123
1971	14.0244102478027
1972	14.9970502853394
1974	17.8757305145264
1975	14.8244895935059
1976	16.1155700683594
1977	23.2745494842529
1978	26.6278800964355
1979	26.4736499786377
1980	29.4687690734863
1982	32.5159797668457
1983	33.4705581665039
1984	34.1208610534668
1985	36.9912300109863
1986	34.8403205871582
1991	31.1649303436279
1993	30.3169803619385
2006	57.3545684814453
2007	59.2733383178711
2008	59.3647994995117
2010	66.0755767822266
2011	65.6973037719727
2012	64.1757583618164