79% (2011)

74% (1981)

64% (2008)

57% (2004)

68% (1975)

67% (1988)

70% (2002)

65% (1977)

50% (1984)

58% (1983)

32% (1982)

47% (1992)

62% (2003)

60% (1979)

20% (1978)

20% (1996)

27% (1985)

64% (1994)

0% (1977)

0% (1981)