83% (2005)

82% (1997)

80% (1993)

83% (2001)

79% (2000)

69% (2001)

78% (2003)

65% (1995)

72% (1994)

79% (1999)

82% (1998)

72% (2008)

79% (1996)

68% (1999)

82% (2002)

71% (2002)

64% (1998)

73% (1998)

77% (1996)

77% (1995)