Shabba - 10:26 am on Sep 7, 2001 (gmt 0)

Does anyone know how to correlate Google AdWord impression figures to the WordTracker numbers? In WordTracker there is an explanation of the ratio between the number of terms in their database (300 million over 60 days) and the number of daily search requests for all other search services (about 319 million/day). How can I get a reliable ratio (expressed as a percentage) to use for Google and WordTracker to be able to understand how much of the daily search each term is?
Does my question make any sense? :)