69% (1961)

61% (1960)

57% (1969)

58% (1966)

78% (1971)

86% (1968)

50% (1974)

65% (1960)

67% (1988)

60% (1970)

74% (1970)

59% (1964)

66% (1968)

69% (1963)

61% (1969)

77% (1968)

72% (1962)

52% (1962)

50% (1973)

60% (1974)