50% (1979)

80% (1987)

40% (1975)

40% (1975)

0% (1990)

70% (1973)

0% (1979)

57% (1973)

0% (1975)

40% (1986)

0% (1971)

50% (1981)

70% (1980)

0% (1989)

0% (1975)

0% (1980)

64% (1983)

0% (1957)