79% (2001)

73% (2001)

65% (2000)

77% (1999)

72% (1992)

72% (1996)

75% (1997)

71% (1994)

69% (2011)

72% (2004)

58% (2003)

68% (2000)

67% (2002)

71% (2002)

70% (1995)

74% (1996)

69% (1992)

58% (2000)

73% (2004)

55% (2002)