There has not been any substantial increase in the box office revenues in the past decade in USA. Here are the American box office revenues from 1999 to 2008 :

1999 : $7.3 billion
2000 : $7.5 billion
2001 : $8.1 billion
2002 : $9.3 billion
2003 : $9.2 billion
2004 : $9.2 billion
2005 : $8.8 billion
2006 : $9.1 billion
2007 : $9.6 billion
2008 : $9.8 billion

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