67% (1976)

81% (1984)

70% (1979)

59% (1974)

55% (1975)

78% (1959)

72% (1966)

70% (1978)

79% (1962)

75% (1961)

83% (1959)

54% (1981)

76% (1973)

72% (1961)

78% (1987)

63% (1967)

76% (1966)

77% (1986)

68% (1963)

75% (1967)