Year	% gross
1971	6.13920021057129
1972	7.20193004608154
1973	9.07540035247803
1974	9.96905040740967
1975	11.2342700958252
1976	11.1307802200317
1977	10.0556297302246
1978	10.3257102966309
1979	9.25611019134521
1980	8.0693302154541
1981	9.26984977722168
1982	9.91475963592529
1983	10.5016803741455
1992	17.1997299194336
1999	57.405158996582
2000	53.4175682067871
2001	55.5351486206055
2002	57.8464012145996
2003	58.7164688110352