66% (1984)

58% (1983)

64% (1982)

40% (1981)

64% (1986)

73% (1982)

60% (1982)

63% (1984)

77% (1984)

42% (1988)

70% (1985)

43% (1986)

52% (1984)

52% (1983)

49% (1985)

49% (1985)

57% (1983)

82% (1981)

0% (1987)

43% (1989)