63% (1962)

73% (1970)

62% (1964)

59% (1965)

64% (1966)

75% (1963)

57% (1969)

61% (1964)

74% (1968)

62% (1966)

72% (1987)

67% (1987)

77% (1967)

59% (1962)

69% (1965)

49% (1988)

40% (1984)

55% (1985)

57% (1965)

50% (1965)