55% (1985)

61% (1981)

59% (1986)

71% (1988)

61% (1984)

60% (1988)

39% (1986)

54% (1981)

50% (1986)

59% (1985)

55% (1987)

60% (1987)

72% (1984)

67% (1984)

50% (1984)

48% (1986)

62% (1983)

52% (1984)

65% (1978)

58% (1985)