20% (1982)

70% (1987)

70% (1980)

85% (1979)

40% (1986)

80% (1987)

0% (1978)

0% (1981)

0% (1968)

0% (1985)

0% (1981)

0% (1979)

80% (1980)

43% (1983)

0% (1979)

0% (1981)

40% (1981)

50% (1984)

65% (1980)

50% (1989)