10% (2003)

40% (1970)

35% (1999)

50% (1994)

0% (1967)

25% (2000)

47% (2005)

0% (1972)

29% (1984)

20% (1998)

30% (1999)

50% (2005)

35% (1999)

20% (1972)

20% (1984)

39% (1998)

45% (1985)

20% (1987)

25% (1992)

45% (1997)