83% (2005)

83% (2001)

79% (2000)

82% (1998)

77% (2003)

81% (1997)

79% (1996)

80% (1993)

80% (1999)

82% (2000)

74% (1998)

76% (2002)

65% (1998)

79% (2002)

82% (1999)

79% (2004)

82% (2002)

64% (2002)

76% (1996)

67% (2001)