NY Times: The Ebb and Flow of Movies: Box Office Receipts 1986 - 2007

http://www.nytimes.com/interactive/2008/02/23/movies/20080223_REVENUE_GRAPHIC.html
"Summer blockbusters and holiday hits make up the bulk of box office revenue each year, while contenders for the top Oscar awards tend to attract smaller audiences that build over time. Here's a look at how movies have fared at the box office, after adjusting for inflation."