73% (2003)

77% (1999)

72% (2002)

74% (2001)

68% (1998)

68% (2001)

74% (2001)

71% (1996)

77% (1994)

79% (2000)

75% (1996)

74% (1995)

62% (1996)

73% (1999)

61% (1996)

70% (2003)

70% (1996)

91% (2003)

68% (1998)

69% (1999)