20% (2001)

20% (2005)

0% (2005)

20% (2002)

20% (2001)

20% (2002)

35% (1995)

20% (2004)

0% (1988)

20% (2001)

0% (2005)

0% (2001)

10% (2002)

20% (1999)

0% (2005)