83% (2005)

82% (2001)

82% (1998)

79% (2000)

78% (2003)

76% (2002)

81% (1997)

74% (1998)

82% (2000)

79% (1999)

79% (1996)

78% (1999)

64% (1996)

80% (2004)

81% (1993)

76% (1996)

66% (1998)

82% (1999)

71% (1994)

69% (2001)