10% (1988)

20% (1971)

0% (1978)

30% (1984)

48% (1990)

0% (1976)

0% (1986)

0% (1976)

0% (1980)

0% (1974)

0% (1970)

39% (1986)

0% (1978)

70% (1990)

40% (1986)

0% (1985)

49% (1980)

80% (1987)

60% (1968)

0% (1970)