64% (1961)

65% (1966)

59% (1964)

64% (1960)

65% (1964)

65% (1968)

63% (1959)

64% (1958)

62% (1965)

61% (1959)

65% (1969)

38% (1992)

60% (1962)

66% (1962)

59% (1970)

61% (1964)

65% (1963)

66% (1965)

57% (1963)

60% (1960)