72% (1972)

50% (1978)

64% (1974)

65% (1985)

70% (1984)

74% (1976)

60% (1981)

58% (1985)

50% (1971)

0% (1979)

45% (1978)

0% (1980)

0% (1979)

50% (1985)

95% (1979)

65% (1986)

44% (1993)

30% (1992)