erikbond101 - Porters should increase exponentially (atleast not progressively) as we move the dates beyond 2007. Even between the 2005-2007/08, I believe, USCIS sees a number of porting cases and thats why they set the cut-off dates at Sep2004. I even believe porters should increase exponentially after April 2005, becos, till then the RIR and TR (non-RIR) processes were a pain to get a labor approved and not many people are left in the GC queue anymore (either they got GCs, ported already or left the country) - remember the Perm labor changed the picture altogether, even with Perm the initial few months (Apr-Jun'05) the employers and attorneys were reluctant to file and once they see labor approvals in 60 days, they started filing in mass and the EB3 demand data reflects that. This whole thing caused USCIS to put an end on the substitution labor stuff but I strongly believe that back-fired them with this huge backlog - but the other side they are milking money - earlier there used to be one labor - it either gets used or sustituted, now it gets used or wasted. Wastage is good for USCIS, because for the same guy another labor will be filed by another employer.
So my point is, 3k is very low - should be atleast double that number in reality, especially if you are looking at date movements beyond late 2007.