78% (2015)

63% (2014)

64% (2016)

63% (2016)

57% (2005)

64% (2002)

64% (2002)

56% (2010)

64% (2000)

58% (2007)

63% (2005)

60% (2004)

59% (2002)

57% (2008)

58% (2009)

64% (2008)

0% (1970)

0% (1970)