55% (1962)

62% (1963)

43% (1978)

58% (1968)

61% (1972)

72% (1970)

57% (1971)

73% (1990)

83% (1955)

57% (1968)

59% (1965)

62% (1959)

61% (1958)

46% (1971)

65% (1968)

63% (1959)

69% (1970)

62% (1964)

59% (1963)

64% (1966)