Go to first page in this thread. See 2nd post. This is the 14692 highest Production X in the USA number. Not total worldwide. The monthly rate is slowing due to the 'D' but not by much.
To me it looks like the monthly rate is about half of previous month. One reason is of course the ModelS 85D, Dual Drive, but also Q3-meeting with another delay for the delivery date of Model X must have had a negative impact. I guess we wont see much higher monthly rate for reservations until Q2 next year. For Tesla Motors it will not be that bad, how many car companies can show more than a yearly productions of reservations for a model they have not yet released? Add to this the reservation payment of $5 000 or $30 000.