It appears that the page on the QDMA link is dated 2005. If it was published in 2005, the data would be a year or two older than that. That would, of course, lead to a margin for error anywhere but would be especially noticeable in many parts of PA. It would be interesting and valuable if that chart had footnotes that cited to source of the data for each state or region. This map has been out for awhile but I cant find any links thst give a clue when or how often it gets updated.