50% (1980)

20% (1988)

20% (1975)

0% (1991)

0% (1991)

53% (1970)

0% (1981)

20% (1977)

50% (1975)

20% (1998)

20% (1980)

20% (1984)

47% (2005)

35% (1989)

50% (1981)

45% (1997)

40% (1988)

20% (1976)

45% (1985)

25% (2000)