67% (1976)

81% (1984)

77% (1959)

59% (1974)

70% (1979)

70% (1978)

78% (1987)

77% (1973)

55% (1975)

77% (1986)

73% (1966)

82% (1959)

54% (1981)

79% (1962)

75% (1983)

75% (1967)

76% (1966)

68% (1991)

63% (1967)

69% (1963)