suninphx,
Yes,Oct'11 i485 receipts include PWMB's. Looking at EB2IC PERM certifications after July-2007 this number is not significant between 15APR2007 to 15JUL2007 (~3.5k PERMS).
You can apply EB2:EB3, i140 denial ratio and any other factors to estimate possible EB2IC PWMB's for the three month period.