59% (1963)

47% (1955)

52% (1966)

43% (1967)

80% (1964)

36% (1965)

56% (1971)

50% (1979)

45% (1958)

39% (1956)

53% (1967)

42% (1971)

63% (1962)

57% (1959)

48% (1965)

52% (1977)

52% (1976)

46% (1957)

44% (1969)

70% (1965)