83% (2013)

76% (2008)

56% (2001)

68% (2009)

50% (1998)

83% (2015)

70% (2012)

60% (2006)

50% (1983)

50% (1978)

75% (1971)

85% (2011)

90% (2011)

69% (1983)

72% (2009)

70% (1994)

0% (1969)

40% (1995)

72% (2008)

88% (1996)