56% (1986)

46% (1987)

59% (1986)

64% (1987)

61% (1986)

55% (1987)

58% (1984)

66% (1982)

63% (1985)

62% (1985)

50% (1984)

67% (1984)

58% (1985)

57% (1987)

57% (1989)

62% (1983)

57% (1987)

70% (1985)

59% (1985)

49% (1983)