74% (1948)

70% (1958)

77% (1978)

68% (1969)

72% (1939)

70% (1979)

72% (1981)

63% (1955)

76% (1958)

75% (1973)

66% (1975)

68% (1980)

70% (1967)

73% (1964)

59% (1956)

62% (1986)

63% (1962)

63% (1965)

70% (1939)

56% (1999)