54% (1988)

48% (1990)

58% (1989)

46% (1991)

49% (1988)

61% (1988)

49% (1989)

59% (1990)

22% (1988)

49% (1990)

45% (1988)

43% (1992)

60% (1988)

53% (1987)

24% (1990)

62% (1989)

40% (1986)

38% (1987)

30% (1987)