69% (2001)

83% (2005)

84% (2005)

80% (2004)

80% (2002)

81% (2005)

56% (2003)

74% (1991)

75% (1985)

71% (2006)

83% (1993)

61% (1990)

81% (2001)

62% (1994)

54% (2003)

58% (1988)

67% (1999)

66% (1995)

70% (1991)

67% (1991)