75% (2011)

62% (2014)

67% (2010)

43% (2016)

49% (2008)

47% (2014)

71% (2016)

62% (2012)

68% (2013)

44% (2012)

56% (2010)

53% (2009)

57% (2008)

53% (2006)

53% (2010)

49% (2008)

71% (2006)

56% (2007)

56% (2011)

80% (2012)