54% (1988)

55% (1982)

55% (1987)

57% (1981)

55% (1983)

52% (1985)

60% (1984)

38% (1985)

66% (1984)

72% (1985)

59% (1983)

32% (1984)

51% (1982)

54% (1983)

51% (1987)

58% (1984)

56% (1982)

39% (1988)

62% (1985)

40% (1980)