79% (1999)

74% (1990)

60% (2009)

37% (2009)

80% (2002)

86% (2005)

83% (2004)

70% (2009)

83% (2011)

80% (2009)

78% (2006)

71% (1993)

54% (1992)

67% (2010)

75% (2008)

51% (2011)

62% (2011)

64% (2010)

76% (2009)

38% (2010)