54% (1988)

55% (1982)

55% (1987)

57% (1981)

51% (1987)

58% (1984)

59% (1983)

66% (1984)

55% (1983)

50% (1986)

38% (1985)

32% (1984)

72% (1985)

51% (1982)

56% (1982)

54% (1983)

52% (1985)

60% (1984)

10% (1978)

62% (1985)