Year	% gross
1975	55.7500381469727
1976	75.6271514892578
1977	75.5230178833008
1979	78.8113174438477
1980	80.9682693481445
1981	72.6852188110352
1987	73.9984436035156
1990	78.0156097412109
1991	76.599479675293
1995	78.8566818237305
1996	79.0184631347656
1999	81.9771499633789
2000	85.4337463378906
2001	78.1967926025391
2002	83.3341217041016
2003	81.4059600830078
2004	90.5749282836914
2005	92.884033203125
2007	90.7016525268555
2011	91.879997253418