63% (1979)

62% (1978)

58% (1965)

39% (1960)

50% (1976)

60% (1976)

60% (1979)

57% (1964)

62% (1974)

50% (1977)

66% (1963)

56% (1977)

38% (1963)

49% (1965)

67% (1973)

65% (1964)

59% (1973)

47% (1972)

57% (1974)

58% (1976)