74% (1999)

65% (2001)

78% (2006)

83% (1993)

81% (1981)

82% (1999)

62% (1989)

69% (2005)

67% (1999)

69% (1997)

80% (2004)

100% (1982)

60% (1989)

62% (1990)

56% (1998)

70% (1994)

0% (2001)

80% (2006)

0% (2009)

57% (1985)