78% (2011)

68% (2015)

78% (1984)

76% (2003)

58% (1977)

62% (2002)

64% (1987)

69% (1981)

60% (2016)

77% (2004)

55% (1985)

69% (2014)

20% (2000)

65% (1989)

60% (1976)

65% (2013)

0% (2008)

85% (2005)

60% (1983)

40% (1987)