70% (1973)

10% (1980)

0% (1978)

40% (1975)

70% (1980)

0% (1971)

0% (1979)

50% (1979)

80% (1987)

57% (1973)

0% (1975)

50% (1981)

40% (1975)

0% (1980)

40% (1986)

0% (1990)

0% (1957)

0% (1975)

0% (1989)

64% (1983)