72% (1988)

58% (1986)

39% (1989)

40% (1983)

49% (1983)

30% (1992)

57% (1987)

53% (1971)

52% (1979)

68% (1986)

20% (1989)

50% (1980)

28% (1984)

51% (1990)

46% (1992)

48% (1986)

55% (1984)

53% (1987)

52% (1984)

44% (1972)