67% (2002)

60% (2001)

66% (1985)

63% (2005)

49% (2006)

41% (2004)

66% (1990)

66% (1996)

51% (2008)

63% (1999)

45% (1989)

64% (2004)

46% (1981)

34% (1998)

0% (1987)

0% (1977)