65% (1961)

83% (1975)

66% (1974)

71% (1971)

80% (1969)

80% (1980)

78% (1973)

57% (1976)

35% (1968)

69% (1984)

82% (1985)

81% (1980)

90% (1962)

64% (1980)

77% (1977)

60% (1988)

77% (1985)

90% (1990)

61% (1974)

68% (1968)