83% (2005)

82% (2001)

78% (2003)

81% (1997)

79% (2000)

80% (1993)

79% (1999)

79% (1996)

82% (1998)

76% (1996)

82% (1999)

71% (1994)

72% (2008)

79% (2002)

75% (2001)

65% (1995)

71% (1995)

71% (2002)

80% (2004)

82% (2002)