I have viewed the films in bold .
1927-28 Janet Gaynor - Seventh Heaven
1928-29 Mary Pickford - Coquette
1929-30 Norma Shearer - The Divorcee
1930-31 Marie Dressler - Min and Bill
1931-32 Helen Hayes - The Sin of Madelon Claudet
1932-33 Katharine Hepburn - Morning Glory
1934 Claudette Colbert - It Happened One Night
1935 Bette Davis - Dangerous
1936 Luise Rainer - The Great Ziegfeld
1937 Luise Rainer - The Good Earth
1938 Bette Davis - Jezebel
1939 Vivien Leigh - Gone with the Wind
1940 Ginger Rogers - Kitty Foyle
1941 Joan Fontaine - Suspicion
1942 Greer Garson - Mrs. Miniver
1943 Jennifer Jones - The Song of Bernadette
1944 Ingrid Bergman - Gaslight
1945 Joan Crawford - Mildred Pierce
1946 Olivia de Havilland - To Each His Own
1947 Loretta Young - The Farmer's Daughter
1948 Jane Wyman - Johnny Belinda
1949 Olivia de Havilland - The Heiress
1950 Judy Holliday - Born Yesterday
1951 Vivien Leigh - A Streetcar Named Desire
1952 Shirley Booth - Come Back, Little Sheba
1953 Audrey Hepburn - Roman Holiday
1954 Grace Kelly - The Country Girl
1955 Anna Magnani - The Rose Tattoo
1956 Ingrid Bergman - Anastasia
1957 Joanne Woodward - The Three Faces of Eve
1958 Susan Hayward - I Want to Live!
1959 Simone Signoret - Room at the Top
1960 Elizabeth Taylor - Butterfield 8
1961 Sophia Loren - Two Women
1962 Anne Bancroft - The Miracle Worker
1963 Patricia Neal - Hud as Alma Brown
Leslie Caron - The L-Shaped Room
1964 Julie Andrews - Mary Poppins
1965 Julie Christie - Darling
1966 Elizabeth Taylor - Who's Afraid of Virginia Woolf?
1967 Katharine Hepburn - Guess Who's Coming to Dinner
1968 Katharine Hepburn - The Lion in Winter
(tied with) Barbra Streisand - Funny Girl
1969 Maggie Smith - The Prime of Miss Jean Brodie
1970 Glenda Jackson - Women in Love
1971 Jane Fonda - Klute
1972 Liza Minnelli - Cabaret
1973 Glenda Jackson - A Touch of Class
1974 Ellen Burstyn - Alice Doesn't Live Here Anymore
1975 Louise Fletcher - One Flew Over the Cuckoo's Nest
1976 Faye Dunaway - Network
1977 Diane Keaton - Annie Hall
1978 Jane Fonda - Coming Home
1979 Sally Field - Norma Rae
1980 Sissy Spacek - Coal Miner's Daughter
1981 Katharine Hepburn - On Golden Pond
1982 Meryl Streep - Sophie's Choice
1983 Shirley MacLaine - Terms of Endearment
1984 Sally Field - Places in the Heart
1985 Geraldine Page - The Trip to Bountiful
1986 Marlee Matlin - Children of a Lesser God
1987 Cher - Moonstruck
1988 Jodie Foster - The Accused
1989 Jessica Tandy - Driving Miss Daisy
1990 Kathy Bates - Misery
1991 Jodie Foster - The Silence of the Lambs
1992 Emma Thompson - Howards End
1993 Holly Hunter - The Piano
1994 Jessica Lange - Blue Sky
1995 Susan Sarandon - Dead Man Walking
1996 Frances McDormand - Fargo
1997 Helen Hunt - As Good as It Gets
1998 Gwyneth Paltrow - Shakespeare in Love
1999 Hilary Swank - Boys Don't Cry
2000 Julia Roberts - Erin Brockovich
2001 Halle Berry - Monster's Ball
2002 Nicole Kidman - The Hours
2003 Charlize Theron - Monster
2004 Hilary Swank - Million Dollar Baby
2005 Reese Witherspoon - Walk the Line
2006 Helen Mirren - The Queen
2007 Marion Cotillard - La Vie en Rose
2008 Kate Winslet - The Reader
2009 Sandra Bullock - The Blind Side
2010 Natalie Portman - Black Swan
2011 Meryl Streep - The Iron Lady
