75% (1933)

76% (1945)

60% (1978)

55% (2009)

72% (1931)

63% (1997)

56% (2002)

73% (1928)

59% (2003)

68% (2009)

64% (1999)

72% (1988)

55% (2013)

67% (2007)

74% (2003)

65% (1986)

57% (1983)

66% (1971)

69% (1970)

71% (1989)