What was the highest-grossing movie of the 1980s?

The '80s saw the initial blockbuster era of the '70s go into overdrive. Like most things in the '80s, it seemed like movies were on steroids — and people were happy to cough up their dough to see things on the big screen.

There are A LOT of big movies from this decade that made some serious theatrical runs. But only can stand above them all in terms of pure moola. Which movie was it?