Teddy, Thanks for your response.
Basically, I'm trying to see

example)
2007-2008: 48% drop in EB-2 ROW demand created us say 20k SOFAD or just FAD
2008-2009 : 40% drop in EB2-ROW demand created us say 15k SOFAD or just FAD ( SOFAD or FAD whichever is easier, when other factors are constant, it really does not matter)
So, with the above approximations we can estimate the SOFAD for 2011, add/remove/tweak the constant factors( like remove the FD etc) and get to a number X.
I know we already have different approximations, just to compare one more.