63% (1985)

61% (1986)

56% (1986)

58% (1987)

65% (1987)

46% (1987)

60% (1986)

59% (1984)

57% (1989)

63% (1982)

62% (1985)

58% (1987)

69% (1985)

55% (1987)

71% (1988)

58% (1985)

62% (1983)

55% (1986)

55% (1987)

47% (1986)