The New York Times published a very nice graph that displays how box offices evolves along the time for movies between 1986 and 2007. It’s  easy to see the peaks or success: Harry Potter, Lords of the rings, etc. But it’s interesting to see that some movies attract people over a very long period like “My Big Fat Greek Wedding”:

The Ebb and Flow of Movies: Box Office Receipts 1986 – 2007 – The New York Times