Here is the Pending Chinese EB-3 data

Did you check the inventory of pending I-485
http://www.uscis.gov/USCIS/New%20Structure/3rd%20Level%20(Left%20Nav%20Children)/Green%20Card%20-%203rd%20Level/Pending%20Form%20I485%20Reports.pdf
?

You can find how many Chinese EB-3 whose PD is before your PD.

By the way, if CIS gives us enough EB3, we should get 2500 to 2600 EB3C approved in a year.