78% (2011)

63% (2008)

74% (1981)

58% (2004)

68% (1975)

71% (2002)

65% (1977)

32% (1982)

50% (1984)

60% (1979)

69% (1978)

50% (2000)

67% (1988)

0% (1976)

0% (1977)

47% (1992)

60% (1976)

20% (1978)

20% (1996)

62% (2003)