83% (2005)

80% (2002)

84% (2005)

79% (2004)

81% (2005)

76% (1985)

69% (2001)

81% (2001)

74% (1991)

55% (2003)

65% (1998)

71% (2006)

63% (2006)

67% (2002)

61% (1990)

82% (1993)

64% (1994)

53% (2003)

76% (2005)

68% (2008)