54% (1982)

53% (1988)

57% (1981)

55% (1987)

59% (1984)

59% (1983)

66% (1984)

72% (1985)

51% (1987)

54% (1983)

32% (1984)

50% (1986)

54% (1983)

56% (1982)

33% (1985)

52% (1985)

60% (1984)

62% (1985)

0% (1980)

39% (1988)