70% (2006)

65% (1996)

71% (2010)

86% (2003)

74% (2003)

83% (1996)

80% (1999)

88% (1982)

89% (1983)

63% (2008)

85% (1991)

82% (1979)

82% (1988)

79% (1991)

58% (1990)

88% (1992)

80% (2000)

89% (1980)

80% (1990)

83% (1985)