Source:
you can figure out how many visa number are left in 2006 based on data below
Source:
Department of Homeland Security
http://www.uscis.gov/graphics/shared/aboutus/statistics/workload.htm
Immigration Monthly Statistical Report
Receipt numbers for I-485 permanent resident adjustments.
May not released yet
April 51,360
Mar 58,586
Feb 46,617
Jan 45,319
Dec 45,125
Nov 42,879
OCT can not be found
FI: annual minimum family-sponsored preference limit of 226,000. The worldwide level for annual employment-based preference immigrants is at least 140,000.