77% (1969)

77% (1962)

60% (1963)

65% (1951)

72% (1960)

59% (1969)

70% (1966)

50% (1971)

40% (1973)

70% (1956)

64% (1958)

66% (1959)

48% (1962)

62% (1958)

58% (1953)

64% (1961)

60% (1958)

80% (1972)

65% (1964)

70% (1969)