58% (1980)

73% (1988)

52% (1982)

69% (1987)

55% (1986)

63% (1979)

59% (1987)

63% (1987)

62% (1985)

64% (1988)

66% (1988)

63% (1986)

53% (1987)

63% (1984)

61% (1988)

68% (1985)

55% (1987)

53% (1981)

58% (1988)

59% (1985)