30% (1979)

71% (1981)

37% (1983)

50% (1984)

66% (1979)

48% (1982)

55% (1987)

60% (1979)

46% (1980)

45% (1987)

52% (1978)

40% (1981)

33% (1985)

10% (1952)

50% (1984)