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2-3/8% 20-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2027

Ref CPI and Index Ratios for December 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            TIPS of January 2027
    CUSIP NUMBER:                           912810PS1
    DATED DATE:                             January 15, 2007
    ORIGINAL ISSUE DATE:                    January 31, 2007
    ADDITIONAL ISSUE DATE:                  July 31, 2007
    MATURITY DATE:                          January 15, 2027
    Ref CPI on DATED DATE:                  201.66452
    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       1.03385
    December        2          2007    208.50439       1.03392
    December        3          2007    208.51877       1.03399
    December        4          2007    208.53316       1.03406
    December        5          2007    208.54755       1.03413
    December        6          2007    208.56194       1.03420
    December        7          2007    208.57632       1.03427
    December        8          2007    208.59071       1.03435
    December        9          2007    208.60510       1.03442
    December        10         2007    208.61948       1.03449
    December        11         2007    208.63387       1.03456
    December        12         2007    208.64826       1.03463
    December        13         2007    208.66265       1.03470
    December        14         2007    208.67703       1.03477
    December        15         2007    208.69142       1.03484
    December        16         2007    208.70581       1.03492
    December        17         2007    208.72019       1.03499
    December        18         2007    208.73458       1.03506
    December        19         2007    208.74897       1.03513
    December        20         2007    208.76335       1.03520
    December        21         2007    208.77774       1.03527
    December        22         2007    208.79213       1.03534
    December        23         2007    208.80652       1.03542
    December        24         2007    208.82090       1.03549
    December        25         2007    208.83529       1.03556
    December        26         2007    208.84968       1.03563
    December        27         2007    208.86406       1.03570
    December        28         2007    208.87845       1.03577
    December        29         2007    208.89284       1.03584
    December        30         2007    208.90723       1.03591
    December        31         2007    208.92161       1.03599