20% (1988)

0% (1969)

0% (1975)

80% (1972)

0% (1963)

0% (1986)

10% (1982)

45% (1979)

80% (1983)

40% (1986)

10% (1967)

20% (1968)

0% (1986)

0% (1987)

0% (1985)

40% (1971)

60% (1979)

0% (1977)

10% (1988)

0% (1975)