49% (2006)

63% (2005)

66% (1985)

60% (2001)

66% (1990)

68% (2002)

45% (1989)

66% (1996)

63% (1999)

51% (2008)

41% (2004)

34% (1998)

64% (2004)

0% (1987)

46% (1981)

0% (1977)