If you skip down the page to the list adjusted for inflation it paints a different picture:
1 Gone with the Wind $3,301,400,000 1939
2 Avatar $2,782,300,000 2009
3 Star Wars $2,710,800,000 1977
4 Titanic $2,413,800,000T 1997
5 The Sound of Music $2,269,800,000 1965
6 E.T. the Extra-Terrestrial $2,216,800,000 1982
7 The Ten Commandments $2,098,600,000 1956
8 Doctor Zhivago $1,988,600,000 1965
9 Jaws $1,945,100,000 1975
10 Snow White and the Seven Dwarfs $1,746,100,000 1937