55% (1987)

45% (1982)

67% (1979)

71% (1981)

45% (1987)

46% (1980)

47% (1981)

51% (1984)

33% (1985)

53% (1978)

30% (1979)

52% (1984)

60% (1979)

38% (1983)

10% (1952)