73% (1964)

80% (1960)

80% (1957)

77% (1966)

74% (1951)

63% (1968)

65% (1963)

62% (1968)

57% (1969)

43% (1973)

52% (1958)

56% (1956)

59% (1961)

62% (1949)

56% (1964)

60% (1954)

58% (1970)

65% (1957)

74% (1963)

61% (1971)