49% (1988)

75% (1984)

34% (1986)

72% (1983)

66% (1986)

44% (1979)

74% (1981)

73% (1975)

50% (1981)

72% (1981)

70% (1986)

70% (1986)

90% (1975)

40% (1978)

52% (1982)

69% (1980)

53% (1970)

0% (1986)

30% (1975)

39% (1977)