55% (1982)

53% (1988)

55% (1987)

57% (1981)

52% (1987)

56% (1983)

59% (1983)

55% (1984)

53% (1982)

66% (1984)

62% (1985)

32% (1984)

38% (1985)

42% (1988)

47% (1986)

54% (1983)

51% (1982)

10% (1978)

72% (1985)

52% (1985)