Year	% gross
1971	2.16827988624573
1972	2.3102400302887
1973	2.43865990638733
1974	3.29460000991821
1975	4.52807998657227
1976	5.74669981002808
1977	6.16479015350342
1978	6.37108993530273
1979	6.16890001296997
1980	6.36109018325806
1981	6.20357990264893
1982	5.93505001068115
1983	5.88574981689453
1984	5.67863988876343
1985	5.48021984100342
1986	7.8043098449707
1987	8.06721973419189
1988	8.53394985198975
1989	9.05636024475098
1999	8.08656024932861
2000	8.3486499786377
2002	8.72731971740723
2004	11.3647499084473
2005	11.3892297744751