Graham & Dodd PE

I must be retarded. I've been trying to calculate the Graham and Dodd PE for something simple like CVX. The calculation should be straight forward, the current price / average of the last 10 years Earnings.

So I tried CVX and calculated a GD PE of 14. Bloomberg DES shows a PE of ~9. Anyone else out there calculate the GD PE and can check CVX PE?

Thanks!
 
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