58% (1972)

53% (1984)

59% (1987)

66% (1987)

33% (1991)

64% (1970)

50% (1970)

0% (1979)

53% (1971)

45% (1989)

0% (1976)

71% (1981)

65% (1988)

20% (1976)

80% (1975)

0% (1981)

72% (1971)

60% (1980)

64% (1985)

0% (1964)