66% (1981)

48% (1984)

43% (1983)

60% (1985)

62% (1983)

59% (1984)

70% (1979)

63% (1980)

47% (1984)

63% (1985)

58% (1983)

69% (1989)

66% (1981)

70% (1984)

60% (1987)

59% (1982)

62% (1980)

53% (1985)

52% (1982)

45% (1985)