76% (1962)

70% (1974)

80% (1969)

63% (1988)

79% (1980)

65% (1961)

71% (1971)

64% (1980)

70% (1983)

57% (1976)

78% (1973)

90% (1962)

69% (1975)

83% (1975)

63% (1974)

65% (1982)

76% (1977)

77% (1985)

65% (1976)

69% (1984)