83% (2005)

82% (2001)

79% (2000)

82% (1998)

78% (2003)

81% (1997)

80% (1993)

79% (1999)

65% (1998)

79% (1996)

73% (1998)

82% (2000)

79% (2004)

82% (1999)

76% (2002)

79% (2002)

77% (1999)

67% (2001)

72% (2008)

76% (1996)