80% (1999)

75% (1990)

86% (2005)

72% (1993)

80% (2002)

60% (2009)

70% (2009)

36% (2009)

83% (2011)

55% (1992)

83% (2004)

80% (2009)

68% (2010)

78% (2006)

75% (2009)

75% (2008)

61% (2011)

64% (2010)

51% (2008)

68% (2010)