82% (2005)

69% (2001)

83% (2005)

80% (2004)

55% (2003)

66% (1991)

71% (1995)

80% (2002)

61% (1990)

81% (2005)

76% (1985)

74% (1991)

62% (2006)

81% (2001)

68% (2002)

71% (2006)

83% (1993)

62% (1994)

58% (1988)

54% (2003)