74% (1990)

80% (1999)

60% (2009)

55% (1992)

36% (2009)

86% (2005)

79% (2002)

72% (1993)

80% (2009)

83% (2011)

83% (2004)

70% (2009)

78% (2006)

68% (2010)

64% (2010)

75% (2009)

51% (2008)

61% (2011)

64% (2011)

75% (2008)