Is this the latest I485 pending inventory (incl all service centers + field offices); it says the information is as of June'11:
http://www.uscis.gov/USCIS/Green%20C...une%202011.pdf
From mid-Oct'06 to Aug'07, there are around 14.5K pending EB2-I cases and 7.3K pending EB2-C cases (considering half of the cases in Oct'06 have PD prior to 15th Oct'06); i.e. nearly 22K pending EB2-I+C applications with PD's after Oct'15 to around Aug'07.