Nla, they don’t. The numbers where for the 2005 Census followup statiscal sampling of the San Diego – Carlsbad – San Marcus Metro Area. Basically, they are 2005 income data collected by the Bereau.
I’m working on a followup posting today since I’m relaxing with a day off and supposedly getting my Christmas shopping done. It’ll have a drill down from the data showing rent and housing expense. It surprised me. And kind of scares me.