65% (1970)

68% (1956)

69% (1967)

65% (1963)

61% (1974)

58% (1968)

68% (1971)

66% (1953)

68% (1970)

71% (1960)

61% (1973)

63% (1966)

62% (1957)

63% (1973)

59% (1955)

72% (1958)

63% (1956)

77% (1956)

56% (1959)

70% (1967)