78% (2011)

73% (1981)

64% (2008)

57% (2004)

68% (1975)

64% (1977)

50% (1984)

58% (1983)

65% (1988)

29% (1985)

62% (2003)

33% (1982)

47% (1992)

69% (1978)

60% (1979)

64% (2002)

64% (1994)

0% (1976)

67% (1995)

70% (1976)