67% (1974)

79% (1952)

55% (1976)

71% (1973)

68% (1976)

76% (1967)

82% (1975)

52% (1972)

66% (1971)

77% (1975)

51% (1967)

53% (1972)

63% (1955)

62% (1958)

72% (1965)

72% (1953)

55% (1977)

64% (1965)

58% (1977)

63% (1959)