77% (1963)

63% (2002)

74% (1992)

41% (1987)

61% (1974)

63% (2006)

60% (2002)

67% (2007)

53% (2011)

62% (1990)

75% (1933)

70% (2001)

60% (1996)

66% (2007)

67% (2002)

66% (1984)

65% (1986)

69% (1998)

66% (1971)

73% (1985)