Since we don't refine or discuss it here, I doubt that we can give you a good answer. WBSTS's answer is completely right- you'd need an analysis done. The amount will also depend on the efficiency of the refiner.
Considering that there have been two major CPU makers since 2000 (AMD and Intel), and over 20 CPU sockets since that time (Including a couple of slot-based CPUs). This is such a broad question that I don't think an average could be accurately counted.
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