Year	% gross
1976	46.5356483459473
1977	47.0875282287598
1978	45.1967315673828
1979	40.2005195617676
1980	33.4511795043945
1981	29.5438499450684
1982	25.9770107269287
1983	24.1696891784668
1984	24.1716499328613
1985	25.6931591033936
1986	26.6985301971436
1987	29.4666194915771
1988	31.3297100067139
1989	32.3966598510742
1990	32.9503898620605
1991	35.5280418395996
1992	38.6514091491699
1993	41.0826187133789
1994	42.5803298950195
1995	44.7639312744141
1996	48.4334106445312
1997	50.8602905273438
2001	60.5072402954102
2003	62.8665199279785
2006	74.7501068115234
2007	79.2062835693359
2008	84.3430099487305
2009	90.8811416625977
2010	92.2622222900391
2011	94.0232086181641
2012	94.724006652832