78% (2011)

74% (1981)

64% (2008)

57% (2004)

68% (1977)

41% (1983)

29% (1985)

50% (1984)

70% (1976)

35% (1982)

62% (2003)

69% (1978)

64% (2002)

20% (1996)

64% (1977)

57% (1983)

60% (1979)

0% (1981)

50% (2000)

65% (1988)