Top Law Schools

I haven't been able to find this information.
http://www.law.gmu.edu/career/employment_information
There the school reports 27 students working at a firm with 250+ (lawyers?) in 2010 That is about 11%. I know that the 250th largest law firm has fewer than 250 lawyers so is this an accurate base?
I also notice that 2010 was a very bad year for GMU compared to 09 and 08, i guess they had their OCI right around the collapse in 08'
Any thoughts on where GMU's njl 250 placement % is?

You'll have to be in the top 10% to have a shot at NLJ250 firms.

well GMU also reports that about 3% of the class gets A3 clerkship, and surely these students are also at top of the class. Im surprised that you say top 10%, American U reports 15% for nlj250 and i doubt all of the top 15% of the class goes biglaw, i would think top 20% would have a shot, or is American U better for biglaw?