73% (2008)

64% (1996)

67% (1977)

67% (2011)

57% (1985)

45% (1975)

71% (1988)

64% (1980)

77% (2010)

50% (1986)

60% (1976)

45% (2008)

40% (1962)

62% (1990)

50% (1998)

0% (1987)

50% (1974)

0% (1979)

0% (1981)

50% (1976)