83% (2005)

69% (2001)

84% (2005)

55% (2003)

79% (2004)

79% (2002)

76% (1985)

71% (2006)

81% (2005)

74% (1991)

83% (1993)

81% (2001)

77% (2005)

62% (1990)

59% (1988)

71% (1995)

62% (1994)

66% (1998)

54% (2003)

62% (2006)