58% (1985)

49% (1985)

49% (1983)

44% (1980)

69% (1988)

50% (1986)

40% (1985)

54% (1981)

51% (1976)

59% (1987)

47% (1984)

54% (1983)

62% (1984)

55% (1985)

45% (1986)

64% (1986)

59% (1987)

59% (1985)

38% (1985)

66% (1987)