Year	% gross
1971	3.66098999977112
1972	4.35855007171631
1973	5.62682008743286
1974	6.29604005813599
1975	7.32310009002686
1976	7.50404977798462
1977	6.98357009887695
1978	7.14187002182007
1979	6.53366994857788
1980	5.97953987121582
1981	6.90208005905151
1982	7.36501979827881
1983	7.73930978775024
1985	7.96036005020142
1990	11.5347499847412
1992	16.3797702789307
1999	57.0369415283203
2000	53.0212211608887
2001	56.8616981506348
2002	60.7621116638184
2003	61.6012802124023