Year	% gross
1971	0.506850004196167
1972	0.556159973144531
1973	0.591109991073608
1974	0.616540014743805
1975	0.671199977397919
1976	0.652729988098145
1977	0.620459973812103
1978	0.599929988384247
1981	0.749279975891113
1984	0.63305002450943
1985	0.640240013599396
1986	1.70780003070831
1988	1.55036997795105
1989	1.42839002609253
1990	1.35529005527496
1991	1.20103001594543
2000	1.61407005786896
2001	2.03906989097595
2002	1.92174005508423