83% (2005)

84% (2005)

80% (2004)

80% (2002)

81% (2005)

81% (2001)

65% (1998)

75% (1991)

69% (2001)

55% (2003)

75% (1985)

71% (2006)

63% (2006)

83% (1993)

64% (1994)

61% (1990)

71% (1995)

57% (1988)

53% (2003)

76% (2005)