79% (2011)

74% (1981)

57% (2004)

64% (2008)

68% (1975)

50% (1984)

64% (2002)

64% (1977)

65% (1988)

29% (1985)

62% (2003)

59% (1983)

35% (1982)

60% (1979)

69% (1978)

0% (1977)

20% (1996)

50% (2000)

0% (1977)

47% (1992)