55% (1990)

40% (2001)

29% (1989)

48% (1996)

28% (2003)

23% (2006)

51% (1992)

52% (2002)

49% (1994)

30% (2001)

13% (1997)

10% (1994)

0% (1996)

30% (1998)

0% (2000)