63% (1987)

48% (1987)

60% (1987)

69% (1988)

35% (1980)

64% (1979)

55% (1986)

60% (1986)

73% (1988)

50% (1983)

52% (1983)

30% (1983)

55% (1984)

53% (1980)

51% (1976)

47% (1988)

65% (1987)

54% (1985)

53% (1999)

38% (1976)