68% (2017)

71% (2007)

72% (2009)

73% (2008)

69% (2003)

61% (2014)

66% (2005)

61% (2014)

73% (1979)

71% (2009)

55% (2015)

50% (2013)

51% (2017)

58% (2010)

0% (1988)

40% (1999)