70% (1957)

76% (1971)

66% (1987)

50% (1939)

57% (1992)

71% (1988)

59% (2011)

62% (1932)

64% (1987)

62% (1990)

73% (1933)

41% (2008)

67% (2010)

59% (2008)

53% (1996)

75% (1968)

69% (1987)

67% (1975)

77% (1976)

70% (1957)