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

Ref CPI and Index Ratios for December 2007

    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:                     December 2007
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) August 2007                 207.917
    CPI-U (NSA) September 2007              208.490
    CPI-U (NSA) October 2007                208.936

    Month      Calendar Day    Year    Ref CPI       Index Ratio

    December        1          2007    208.49000       1.07187
    December        2          2007    208.50439       1.07195
    December        3          2007    208.51877       1.07202
    December        4          2007    208.53316       1.07210
    December        5          2007    208.54755       1.07217
    December        6          2007    208.56194       1.07224
    December        7          2007    208.57632       1.07232
    December        8          2007    208.59071       1.07239
    December        9          2007    208.60510       1.07247
    December        10         2007    208.61948       1.07254
    December        11         2007    208.63387       1.07261
    December        12         2007    208.64826       1.07269
    December        13         2007    208.66265       1.07276
    December        14         2007    208.67703       1.07284
    December        15         2007    208.69142       1.07291
    December        16         2007    208.70581       1.07298
    December        17         2007    208.72019       1.07306
    December        18         2007    208.73458       1.07313
    December        19         2007    208.74897       1.07321
    December        20         2007    208.76335       1.07328
    December        21         2007    208.77774       1.07335
    December        22         2007    208.79213       1.07343
    December        23         2007    208.80652       1.07350
    December        24         2007    208.82090       1.07358
    December        25         2007    208.83529       1.07365
    December        26         2007    208.84968       1.07372
    December        27         2007    208.86406       1.07380
    December        28         2007    208.87845       1.07387
    December        29         2007    208.89284       1.07395
    December        30         2007    208.90723       1.07402
    December        31         2007    208.92161       1.07409