71% (1972)

60% (1981)

74% (1976)

69% (1984)

60% (1974)

50% (1978)

65% (1985)

30% (1992)

95% (1979)

50% (1971)

60% (1993)

0% (1980)

53% (1985)

65% (1986)

45% (1978)

0% (1979)

50% (1985)

0% (1979)