66% (1984)

70% (1985)

72% (1982)

64% (1982)

58% (1983)

64% (1986)

42% (1982)

82% (1981)

49% (1985)

60% (1982)

58% (1985)

49% (1985)

63% (1984)

40% (1981)

52% (1986)

48% (1984)

57% (1983)

59% (1983)

43% (1986)

59% (1982)