Year-by-Year: 1930s

For the timebeing, since I haven't seen nearly enough, I'll just do my winners for some of these...

1930

Best Picture: All Quiet on the Western Front

Best Director: Lewis Milestone, All Quiet on the Western Front

Best Actor: Lew Ayres, All Quiet on the Western Front

Best Actress:

Best Supporting Actor: Louis Wolheim, All Quiet on the Western Front

Best Supporting Actress:

1931

1. M
2. City Lights
3. Public Enemy
4. Frankenstein
5. Skippy

Best Director: Fritz Lang, M

Best Actor:

1. Peter Lorre, M
2. Charlie Chaplin, City Lights
3. Jackie Cooper, Skippy
4. James Cagney, Public Enemy
5. Boris Karloff, Frankenstein

Best Actress: Virginia Cherrill, City Lights

Best Supporting Actor: Harry Myers, City Lights

Best Supporting Actress: Jean Harlow, Public Enemy

1932 (can't comment)

1933

1. Duck Soup
2. King Kong
3. The Invisible Man
4. The Private Life of Henry VIII

1934

1. It Happened One Night
2. The Thin Man
3. The Black Cat
4. Manhattan Melodrama

Best Director: Frank Capra, It Happened One Night

Best Actor: Clark Gable, It Happened One Night

Best Actress: Claudette Colbert, It Happened One Night

1935

1. The Informer
2. The 39 Steps
3. Bride of Frankenstein
4. The Scarlet Pimpernel
5. A Midsummer Night's Dream
6. Les Miserables

Best Director: James Whale, Bride of Frankenstein

Best Actor: Victor MacLaglen, The Informer

Best Actress: 

Best Supporting Actor: James Cagney, A Midsummer Night's Dream

Best Supporting Actress: Elsa Lanchester, Bride of Frankenstein

1936

1. Modern Times
2. Rembrandt
3. After the Thin Man
4. Mr Deeds Goes to Town
5. Come and Get It
6. The Lower Depths
7. The Petrified Forest
8. Secret Agent

Best Director: Charlie Chaplin, Modern Times

Best Actor: Edward Arnold, Come and Get It

Best Actress: Myrna Loy, After the Thin Man

Best Supporting Actor: Louis Jouvet, The Lower Depths

Best Supporting Actress: Paulette Goddard, Modern Times

1937 (can't comment as I've only seen Grand Illusion and Snow White, love them both though)

1938

1. Angels With Dirty Faces
2. Pygmalion
3. The Lady Vanishes
4. The Adventures of Robin Hood
5. You Can't Take It With You

Best Director: Michael Curtiz, Angels With Dirty Faces

Best Actor: James Cagney, Angels With Dirty Faces

Best Actress: Wendy Hiller, Pygmalion

Best Supporting Actor: Pat O'Brien, Angels With Dirty Faces

Best Supporting Actress: Ann Sheridan, Angels With Dirty Faces

1939

1. Gone With the Wind
2. Mr. Smith Goes to Washington
3. Goodbye, Mr Chips
4. The Hunchback of Notre Dame
5. The Wizard of Oz
6. Stagecoach
7. The Four Feathers
8. The Roaring Twenties
9. Ninotchka
10. Only Angels Have Wings

Best Director: Victor Fleming, Gone With the Wind (though I'm not sure if it was just him...)

Best Actor:

1. Charles Laughton, The Hunchback of Notre Dame
2. Robert Donat, Goodbye, Mr Chips
3. Clark Gable, Gone With the Wind
4. James Stewart, Mr Smith Goes to Washington
5. Ralph Richardson, Q Planes

Best Actress:

1. Vivien Leigh, Gone With the Wind
2. Bette Davis, Dark Victory
3. Greta Garbo, Ninotchka
4. Judy Garland, The Wizard of Oz
5. Maureen O'Hara, The Wizard of Oz

Best Supporting Actor:

1. Cecil Hardwicke, The Hunchback of Notre Dame
2. Claude Rains, Mr Smith Goes to Washington
3. Ralph Richardson, The Four Feathers
4. Thomas Mitchell, Stagecoach
5. Bert Lahr, The Wizard of Oz

Best Supporting Actress:

1. Olivia de Havilland, Gone With the Wind
2. Margaret Hamilton, The Wizard of Oz
3. Hattie McDaniel, Gone With the Wind
4. Priscilla Lane, The Roaring Twenties
5. Jean Arthur, Mr Smith Goes to Washington