68% (1974)

69% (2002)

72% (1961)

75% (1932)

78% (1979)

57% (2006)

60% (1956)

73% (1964)

70% (1949)

63% (1989)

67% (1960)

78% (2004)

77% (1979)

73% (1955)

69% (1969)

68% (1995)

64% (1988)

71% (1979)

75% (1962)

60% (1967)