Year	% gross
1971	41.2886581420898
1972	41.3157615661621
1973	42.4909286499023
1974	44.5551986694336
1975	49.8260116577148
1976	57.4978904724121
1977	64.7919921875
1978	69.0473327636719
1979	92.2175674438477
1980	99.1166763305664
1981	99.1454086303711
1982	98.7691421508789
1983	94.7413864135742
1984	93.6065902709961
1985	91.643180847168
1986	92.565299987793
1987	93.4706268310547
1988	95.4761505126953
1989	92.5606536865234
1991	101.077369689941
1992	84.9016876220703
1993	83.3233413696289
1996	75.8255081176758
1999	83.3511199951172
2000	80.9885101318359
2003	87.3158416748047
2004	86.0819320678711
2007	94.0749435424805