59% (1988)

68% (1990)

60% (1989)

33% (1988)

49% (1987)

59% (1988)

52% (1988)

46% (1988)

55% (1987)

64% (1991)

52% (1987)

48% (1988)

75% (1984)

51% (1987)

62% (1992)

53% (1987)

40% (1990)

58% (1990)

71% (1986)

54% (1990)