82% (1988)

65% (1977)

86% (2011)

50% (2013)

66% (1989)

20% (2008)

60% (2003)

59% (1982)

39% (2005)

53% (1962)

56% (2005)

65% (1974)

68% (2005)

45% (2003)

64% (2009)

63% (2008)

47% (2006)

66% (2008)

83% (2013)

20% (2013)