77% (2016)

71% (2005)

79% (2017)

65% (2016)

75% (2014)

69% (2006)

67% (1998)

59% (2006)

68% (1999)

75% (2008)

58% (2003)

65% (2006)

60% (2009)

57% (2008)

59% (2001)

64% (2013)

0% (1970)

63% (2009)

70% (2000)

64% (2006)