64% (2005)

73% (1999)

64% (1971)

57% (1984)

65% (1993)

50% (2009)

69% (1998)

65% (2001)

63% (2009)

65% (2000)

74% (1998)

70% (2003)

62% (2008)

57% (2008)

60% (1997)

76% (1962)

56% (2006)

68% (1984)

66% (1988)

56% (2000)