Year	% gross
1971	112.044242858887
1972	112.659698486328
1973	112.862037658691
1974	112.686050415039
1975	111.987426757812
1976	113.713638305664
1977	110.156402587891
1978	106.89079284668
1979	101.212341308594
1980	97.5538101196289
1981	97.9696197509766
1982	96.1730575561523
1983	96.6595306396484
1984	92.572151184082
1985	92.3387603759766
1986	89.8675231933594
1987	91.0038986206055
1988	91.4873809814453
1989	90.7036590576172
1990	91.3969879150391
1991	91.3051376342773
1992	92.0053176879883
1993	92.7892074584961
1994	93.5584487915039
1995	94.2552032470703
1996	94.6188125610352
1997	95.6749267578125
1998	97.150146484375
1999	99.8713226318359
2000	102.36710357666
2001	98.2725601196289
2002	93.480110168457
2003	95.4565124511719
2004	95.4586486816406
2005	92.4960403442383
2007	95.2358016967773
2008	96.0559768676758
2009	96.0143127441406
2010	96.3096313476562