48% (1970)

58% (1961)

48% (1958)

55% (1965)

50% (1964)

56% (1965)

57% (1972)

51% (1975)

57% (1974)

59% (1971)

62% (1965)

42% (1955)

50% (1976)

80% (1964)

52% (1977)

48% (1969)

62% (1972)

48% (1956)

47% (1970)

38% (1957)