78% (2011)

73% (1981)

64% (2008)

57% (2004)

68% (1975)

50% (1984)

64% (2002)

29% (1985)

62% (2003)

64% (1977)

65% (1988)

59% (1983)

35% (1982)

64% (1994)

0% (1977)

60% (1979)

69% (1978)

20% (1996)

50% (2000)

0% (1977)