64% (2011)

68% (2018)

59% (2013)

65% (2012)

47% (2012)

69% (2007)

56% (2010)

66% (2014)

50% (2015)

66% (2014)

59% (2010)

55% (2018)

56% (2009)

0% (1970)

20% (2010)