61% (1989)

49% (1988)

58% (1989)

58% (1989)

46% (1991)

38% (1987)

57% (1986)

53% (1987)

53% (1988)

43% (1992)

45% (1988)

23% (1988)

49% (1990)

25% (1990)

60% (1988)

40% (1986)

61% (1988)

58% (1989)

30% (1987)