46% (2007)

55% (2009)

57% (2012)

51% (2013)

63% (2012)

59% (2006)

53% (2013)

55% (2005)

58% (2012)

58% (2011)

54% (2012)

50% (2010)

51% (2006)

50% (2012)

40% (2011)

50% (2013)

47% (2011)

55% (2012)

51% (2012)

60% (2015)