36% (1987)

54% (1984)

38% (2012)

20% (1973)

46% (1973)

37% (1976)

39% (1984)

27% (2013)

38% (1985)

47% (2013)

50% (1984)

49% (1983)

31% (2012)

27% (1986)

0% (2008)

55% (2006)

50% (1985)

0% (2007)