79% (2011)

74% (1981)

64% (2008)

58% (2004)

68% (1975)

70% (2002)

67% (1988)

27% (1985)

58% (1983)

50% (1984)

60% (1979)

50% (1977)

0% (1977)

65% (1977)

69% (1978)

32% (1982)

20% (1978)

20% (1996)

0% (1976)

0% (1981)