82% (2005)

83% (2005)

79% (2004)

79% (2002)

81% (2005)

61% (1990)

81% (2001)

58% (1988)

69% (2001)

75% (1991)

55% (2003)

70% (1991)

69% (1999)

76% (1985)

71% (2006)

78% (1991)

83% (1993)

65% (1998)

74% (2002)

63% (2006)