Year	% gross
1979	0.2535699903965
1980	0.214609995484352
1981	0.126190006732941
1982	0.232439994812012
1983	0.108429998159409
1984	0.199399992823601
1986	0.229969993233681
1988	0.287490010261536
1990	0.426279991865158
1991	0.379530012607574
1992	0.398160010576248
1999	0.642130017280579
2000	0.627629995346069
2006	0.492309987545013
2008	1.17326998710632
2009	1.45692002773285
2010	1.22207999229431
2012	1.4794100522995