72% (1972)

50% (1978)

74% (1976)

0% (1979)

60% (1981)

69% (1984)

95% (1979)

65% (1985)

45% (1978)

50% (1985)

60% (1993)

50% (1971)

64% (1974)

0% (1980)

52% (1985)

65% (1986)

30% (1992)

0% (1979)