71% (1981)

51% (1984)

48% (1982)

37% (1983)

60% (1979)

55% (1987)

66% (1979)

47% (1980)

45% (1987)

30% (1979)

40% (1981)

52% (1978)

33% (1985)

10% (1952)

50% (1984)