74% (2008)

64% (2005)

63% (2010)

67% (2011)

65% (2009)

74% (2010)

64% (2006)

61% (2006)

65% (2008)

49% (2004)

54% (2003)

58% (2007)

57% (2004)

50% (2007)

63% (2007)

55% (2006)

75% (2008)

66% (2010)

70% (2008)

73% (2010)