64% (2011)

70% (2007)

65% (2012)

67% (2018)

56% (2010)

51% (2015)

59% (2013)

54% (2018)

66% (2014)

58% (2010)

47% (2012)

66% (2014)

56% (2009)

0% (1970)

20% (2010)