I agree there will not be any way to estimate it. But if all things are equal then these numbers should cancel each other. In other words there are likely as many people who applied for PERM in 2007, 2008 with original (EB3) PD of 2004, 2005 as there are people who applied for PERM in 2010, 2011 with original PD of 2007, 2008.
CM has done some analysis on PERM data using prevailing wage (
http://us-non-immigrants.blogspot.co...-green_20.html) to determine EB2 to EB3 split (72 to 28 for India & 46 to 54 for China). In addition he has also done analysis on India - China ratio in EB2 (on average it is 11 - 1 since 2008).
Therefore, EB2 I + EB2 C applicants / EB2-3 I + EB2-3 C applicants = 12/((11/0.72) + (1/0.46)) = 68.76% ~ 70%. I think this is a good estimate of EB2IC applicants, which coincidentally is what I used in
http://www.qesehmk.org/forums/showth...0253#post10253.
Now Spectator's SOFAD & Porting thread (
http://www.qesehmk.org/forums/showth...oved-in-FY2011) assumes EB2 IC %age at 60%. Now if we can get a calculation done with EB2 IC 70% with 0 porting, then I think we will get a closer approximation of what might happen.
Spectator can you please redo No Porting column assuming 70% EB2 IC applicants focusing on 2008 and beyond (assuming everyone in 2007 gets GC in FY 2012)? I would have done it myself but since all the numbers have been turned to images I would have to start from scratch.