Year	% gross
1971	70.00830078125
1972	70.5350723266602
1973	71.0749816894531
1974	72.5513076782227
1975	75.555419921875
1976	84.720100402832
1977	89.6258926391602
1978	90.6787796020508
1979	105.061981201172
1980	107.950149536133
1981	104.817779541016
1982	102.983451843262
1983	99.9408874511719
1984	100.355491638184
1985	100.020622253418
1986	101.291389465332
1987	102.563957214355
1988	103.563758850098
1989	102.608787536621
1991	111.210830688477
1992	92.5337600708008
1993	91.1717910766602
1996	82.7292709350586
1999	92.7501068115234
2000	90.0989379882812
2003	96.0836791992188
2004	95.075439453125
2007	103.738700866699