82% (2005)

69% (2001)

84% (2005)

81% (2005)

56% (2003)

80% (2004)

66% (1991)

80% (2002)

71% (1995)

62% (1990)

74% (1991)

58% (1988)

76% (1985)

62% (1994)

81% (2001)

66% (1998)

71% (2006)

83% (1993)

54% (2003)

66% (1995)