57% (2010)

52% (2005)

41% (2009)

64% (2006)

64% (2007)

57% (2005)

51% (2009)

63% (2008)

55% (2008)

52% (2008)

54% (2007)

40% (2008)

49% (2010)

50% (2009)

42% (2007)

52% (2006)

43% (2007)

45% (2008)

55% (2006)

50% (2009)