The KBB value of my car went WAY down...WTF!!!?

A few months ago I checked the KBB value of my 2006 Toyota Prius and it was valued at $18,500. I just checked now and it is valued at $15,000. Is this because the new 2012 models came out? This seems like way too much of a decrease. What happened?? It has nothing to do with the mileage, options or zip code.
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