70% (1979)

71% (1981)

45% (1982)

51% (1984)

56% (1987)

46% (1980)

45% (1987)

30% (1979)

47% (1981)

53% (1978)

33% (1985)

52% (1984)

60% (1979)

10% (1952)

38% (1983)