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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2015

Ref CPI and Index Ratios for September 2006

    Contact: Office of Financing       202-504-3550
    DESCRIPTION:                            Series D-2015
    CUSIP NUMBER:                           912828EA4
    DATED DATE:                             July 15, 2005
    ORIGINAL ISSUE DATE:                    July 15, 2005
    ADDITIONAL ISSUE DATE:                  October 17, 2005
    MATURITY DATE:                          July 15, 2015
    Ref CPI on DATED DATE:                  194.50968
    TABLE FOR MONTH OF:                     September 2006
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) May 2006                    202.5
    CPI-U (NSA) June 2006                   202.9
    CPI-U (NSA) July 2006                   203.5

    Month    Calendar Day    Year     Ref CPI      Index Ratio

    September       1        2006    202.90000       1.04314
    September       2        2006    202.92000       1.04324
    September       3        2006    202.94000       1.04334
    September       4        2006    202.96000       1.04344
    September       5        2006    202.98000       1.04355
    September       6        2006    203.00000       1.04365
    September       7        2006    203.02000       1.04375
    September       8        2006    203.04000       1.04386
    September       9        2006    203.06000       1.04396
    September       10       2006    203.08000       1.04406
    September       11       2006    203.10000       1.04416
    September       12       2006    203.12000       1.04427
    September       13       2006    203.14000       1.04437
    September       14       2006    203.16000       1.04447
    September       15       2006    203.18000       1.04458
    September       16       2006    203.20000       1.04468
    September       17       2006    203.22000       1.04478
    September       18       2006    203.24000       1.04488
    September       19       2006    203.26000       1.04499
    September       20       2006    203.28000       1.04509
    September       21       2006    203.30000       1.04519
    September       22       2006    203.32000       1.04530
    September       23       2006    203.34000       1.04540
    September       24       2006    203.36000       1.04550
    September       25       2006    203.38000       1.04560
    September       26       2006    203.40000       1.04571
    September       27       2006    203.42000       1.04581
    September       28       2006    203.44000       1.04591
    September       29       2006    203.46000       1.04601
    September       30       2006    203.48000       1.04612