73% (1962)

71% (1981)

73% (1968)

77% (1969)

80% (1959)

63% (1967)

67% (1969)

63% (1972)

72% (1970)

69% (1971)

72% (1980)

71% (1979)

72% (1964)

78% (1973)

71% (1969)

68% (1975)

71% (1968)

67% (1957)

65% (1978)

71% (1983)