71% (1960)

68% (1962)

67% (1971)

68% (1959)

64% (1968)

59% (2006)

61% (1969)

72% (1966)

79% (1956)

68% (1964)

70% (1970)

68% (1957)

54% (1968)

56% (1972)

41% (1972)

72% (1962)

78% (1961)

66% (1963)

77% (1959)

72% (1948)