78% (2011)

64% (2008)

74% (1981)

50% (1984)

57% (2004)

64% (2002)

70% (1976)

57% (1983)

68% (1977)

62% (2003)

65% (1988)

69% (1978)

41% (1983)

29% (1985)

64% (1977)

35% (1982)

20% (1996)

48% (1992)

0% (1976)

60% (1979)