The full list of winners and nominees from 1929 to the present day is here. It's an interesting- and slightly depressing- record of changing taste. Some years the Academy was overawed by spectacle, other years it flaunted its social conscience. Rather too often it ignored masterpieces and rewarded effortful striving. Its routine neglect of foreign language movies- and snobbishness about genre- means the list is a lousy guide to the history of cinema.
The Oscars are a popularity contest. We really shouldn't take them so seriously.