83% (2005)

78% (2003)

73% (1998)

83% (2001)

81% (1993)

79% (1996)

71% (2002)

82% (1997)

79% (2000)

82% (1998)

65% (1995)

67% (1996)

79% (1999)

69% (2001)

79% (2002)

71% (1995)

77% (1996)

77% (1995)

68% (1996)

72% (1994)