79% (1999)

80% (2002)

74% (1990)

83% (2011)

86% (2005)

80% (2009)

83% (2004)

78% (2006)

70% (2009)

72% (1993)

54% (1992)

60% (2009)

68% (2010)

75% (2008)

61% (2011)

68% (2010)

75% (2009)

50% (2011)

64% (2010)

75% (1993)