The data in these maps have been corrected for the 34% rise in the consumer prices between 1989 and 1999. The figures on the maps are the result of dividing aggregate income in 1999 by population in 1999 by per capita income in 1989. The result was converted into a figure showing percentage change.
Tracts with fewer than 50 people or those for which no per capita income figure was reported for either 1989 or 1999 have been omitted from this analysis.