64% (2008)

74% (2006)

73% (2005)

64% (2011)

69% (2005)

49% (2010)

65% (2007)

61% (2011)

52% (2006)

60% (2006)

62% (2005)

58% (2006)

60% (2006)

61% (2011)

54% (2010)

62% (2005)

60% (2007)