71% (1972)

60% (1974)

69% (1984)

50% (1971)

45% (1978)

50% (1985)

74% (1976)

53% (1985)

60% (1981)

50% (1978)

30% (1992)

95% (1979)

65% (1986)

60% (1993)

65% (1985)

0% (1980)

0% (1979)