77% (2016)

76% (2014)

71% (2005)

66% (2016)

79% (2017)

60% (2006)

61% (2009)

69% (2006)

67% (1998)

57% (2008)

69% (1999)

57% (2003)

75% (2008)

65% (2006)

59% (2001)

65% (2013)

63% (2009)

0% (1970)

71% (2000)

73% (2011)