60% (2001)

67% (2000)

71% (2006)

50% (1990)

88% (2000)

58% (1988)

0% (1988)

45% (2011)

61% (2002)

64% (1991)

58% (1992)

76% (1992)

78% (1998)

83% (2003)

71% (2006)

68% (2000)

79% (2007)

71% (2009)

76% (2009)

55% (1988)