55% (2009)

56% (2012)

59% (2011)

48% (2011)

63% (2012)

49% (2010)

57% (2006)

56% (2005)

61% (2007)

50% (2013)

57% (2012)

41% (2011)

51% (2006)

50% (2013)

52% (2012)

53% (2013)

47% (2009)

52% (2012)

44% (2009)

57% (2011)