70% (1962)

83% (1975)

65% (1961)

66% (1974)

71% (1971)

80% (1969)

80% (1980)

78% (1973)

10% (1971)

90% (1962)

57% (1976)

70% (1978)

69% (1984)

80% (1980)

90% (1990)

64% (1980)

15% (1977)

82% (1985)

81% (1980)

77% (1977)