Here is my take on it based on following assumptions:
1. Everyone up to 12/31/07 gets GC in FY 2012
2. 19,400 SOFAD (includes porting) + 5,600 EB2 IC quota = 25,000 GC / year
-- 2a Approx. 2,000 applications / month or 6,500 / quarter or 12,500 / half year to come up with monthly breakdown
3. Every PERM application requires 1.15 visa numbers at I485 stage using the calculations below:
-- 3a EB2 IC is 70% of total IC PERM (see my other posts for the reason)
-- 3b ~80% I140 conversion rate (CM's analysis
http://us-non-immigrants.blogspot.co...-green_20.html based on
http://www.immigrationwatch.com/usci...tatistics.html)
-- 3c 2.05 visa numbers used by every I485 applicant
-- 3d 1 Perm Application = 0.7*0.8*2.05 = 1.15 I-485 visa numbers
4. All PERM applications as of 3/31/2011 have been completed (PERM data as of 6/30/11). Reasonable assumption since DoL have improved their process and almost all PERM applications are decided within 60 days
5. I think it is reasonable to subtract 6 months (USCIS processing time) from Expected Month column to get an approximation of when you will be current. You can subtract additional time if you think USCIS will be slower.
Petition Date|IC Perm Cases|Visa# Reqd|Expected Visa Available|Expected Month
2007-11-----|2434-----------|2794-------|FY-2012-------------|2012-08
2007-12-----|2247-----------|2580-------|FY-2012-------------|2012-09
2008-01-----|2900-----------|3329-------|FY-2013-------------|2012-10
2008-02-----|2733-----------|3137-------|FY-2013-------------|2012-12
2008-03-----|2244-----------|2576-------|FY-2013-------------|2013-02
2008-04-----|2716-----------|3118-------|FY-2013-------------|2012-03
2008-05-----|2513-----------|2885-------|FY-2013-------------|2012-05
2008-06-----|2142-----------|2459-------|FY-2013-------------|2012-06
2008-07-----|2046-----------|2349-------|FY-2013-------------|2013-07
2008-08-----|2029-----------|2329-------|FY-2013-------------|2013-08
2008-09-----|1891-----------|2171-------|FY-2013-------------|2013-09
2008-10-----|2389-----------|2743-------|FY-2014-------------|2013-10
2008-11-----|1985-----------|2279-------|FY-2014-------------|2013-11
2008-12-----|2069-----------|2375-------|FY-2014-------------|2014-01
2009-01-----|2065-----------|2371-------|FY-2014-------------|2014-02
2009-02-----|1766-----------|2027-------|FY-2014-------------|2014-03
2009-03-----|1794-----------|2060-------|FY-2014-------------|2014-04
2009-04-----|1839-----------|2111-------|FY-2014-------------|2014-05
2009-05-----|1451-----------|1666-------|FY-2014-------------|2014-06
2009-06-----|1462-----------|1678-------|FY-2014-------------|2014-07
2009-07-----|1287-----------|1477-------|FY-2014-------------|2014-08
2009-08-----|1247-----------|1432-------|FY-2014-------------|2014-08
2009-09-----|1489-----------|1709-------|FY-2014-------------|2014-09
2009-10-----|1502-----------|1724-------|FY-2014-------------|2014-09
2009-11-----|1359-----------|1560-------|FY-2015-------------|2014-10
2009-12-----|1479-----------|1698-------|FY-2015-------------|2014-10
2010-01-----|1495-----------|1716-------|FY-2015-------------|2014-11
2010-02-----|1318-----------|1513-------|FY-2015-------------|2014-12
2010-03-----|1734-----------|1991-------|FY-2015-------------|2015-01
2010-04-----|1610-----------|1848-------|FY-2015-------------|2015-02
2010-05-----|1672-----------|1919-------|FY-2015-------------|2015-03
2010-06-----|2035-----------|2336-------|FY-2015-------------|2015-04
2010-07-----|1761-----------|2022-------|FY-2015-------------|2015-06
2010-08-----|2273-----------|2609-------|FY-2015-------------|2015-07
2010-09-----|2264-----------|2599-------|FY-2015-------------|2015-08
2010-10-----|2445-----------|2807-------|FY-2015-------------|2015-09
2010-11-----|2507-----------|2878-------|FY-2016-------------|2015-10
2010-12-----|3207-----------|3682-------|FY-2016-------------|2015-11
2011-01-----|2782-----------|3194-------|FY-2016-------------|2016-01
2011-02-----|2950-----------|3387-------|FY-2016-------------|2016-03
2011-03-----|2823-----------|3241-------|FY-2016-------------|2016-04
2011-04-----|1495-----------|1716-------|FY-2016-------------|2016-06
2011-05-----|0005-----------|0006-------|FY-2016-------------|Additional-Data-needed
2011-06-----|0001-----------|0001-------|FY-2016-------------|Additional-Data-needed