77% (2008)

78% (2003)

0% (1999)

83% (2010)

61% (2011)

74% (2015)

74% (1988)

70% (2010)

0% (2003)

65% (2003)

71% (2005)

70% (2006)

68% (2013)

69% (2010)

76% (2017)

75% (2006)

72% (2011)

71% (2015)

72% (2014)

70% (2012)