20% (1977)

20% (1980)

35% (2006)

20% (1978)

20% (1997)

80% (1979)

0% (1977)

52% (1999)

50% (1980)

0% (2005)

20% (1977)

20% (1990)

20% (1994)

20% (1990)

0% (1997)

40% (2002)

20% (1989)

35% (1978)

50% (1996)

20% (1979)