76% (2009)

46% (2002)

52% (2012)

74% (2007)

70% (2008)

70% (2005)

78% (2014)

63% (2005)

34% (1978)

58% (1991)

45% (1992)

68% (2010)

71% (2009)

69% (2001)

70% (2008)

73% (2008)

63% (1986)

72% (2009)

73% (2011)

46% (1998)