79% (2011)

73% (1981)

64% (2008)

57% (2004)

68% (1975)

50% (1984)

66% (1988)

64% (1977)

64% (2002)

20% (1996)

29% (1985)

62% (2003)

57% (1983)

35% (1982)

41% (1983)

60% (1979)

69% (1978)

70% (1976)

0% (1976)

47% (1992)