66% (1964)

38% (1960)

52% (1979)

53% (1966)

57% (1961)

63% (1979)

50% (1976)

37% (1958)

50% (1968)

49% (1977)

42% (1956)

52% (1963)

55% (1963)

63% (1961)

66% (1963)

49% (1960)

66% (1963)

32% (1958)

47% (1962)

59% (1976)