Top 20 Movies of the 1970's

You hear a lot about which movies were the biggest hits of the 1970's. This was pre Avatar and Titanic, so there is a lot of artistic license exercised when talking about the period. 

I looked the figures up and found the gross box office worldwide for each movie. The figures I have are for the twelve months following the year of release. I'm going to stick my neck out and say the order stays the same over time, statistically speaking.

Without further ado, here are the top 20 (click on image to enlarge):-