82% (2005)

84% (2005)

55% (2003)

81% (2005)

80% (2002)

80% (2004)

69% (2001)

81% (2001)

75% (1985)

72% (2006)

83% (1993)

64% (2006)

75% (1991)

66% (1998)

62% (1994)

66% (1991)

68% (2002)

62% (1990)

54% (2003)

58% (1988)