The biggest-grossing movies, by decade were:
1910-19 The Birth of a Nation (1915) 1920-29 The Big Parade (1925)
1930-39 Gone With the Wind (1939) 1940-49 Song of the South (1946)
1950-59 The Ten Commandments (1956) 1960-69 The Sound of Music (1965) 1970-79 Star Wars (1977)
1980-89 E.T., the Extra-Terrestrial (1982)