0% (2005)

35% (2008)

50% (2005)

20% (1996)

10% (1975)

35% (2006)

20% (1980)

20% (1988)

0% (1989)

20% (2002)

0% (1992)

0% (1990)

70% (1994)

20% (1997)

0% (1978)

20% (1979)

20% (1976)

20% (1997)

90% (1989)

20% (1987)