53% (2003)

82% (2001)

74% (2000)

82% (1999)

65% (2000)

70% (1996)

83% (2002)

81% (1997)

77% (1999)

75% (1996)

78% (1995)

73% (2003)

71% (1996)

68% (2001)

91% (2003)

75% (1995)

73% (1999)

76% (2001)

68% (1998)

53% (2004)