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2-1/2% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2016

Ref CPI and Index Ratios for December 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2016
    CUSIP NUMBER:                           912828FL9
    DATED DATE:                             July 15, 2006
    ORIGINAL ISSUE DATE:                    July 17, 2006
    ADDITIONAL ISSUE DATE:                  October 16, 2006
    MATURITY DATE:                          July 15, 2016
    Ref CPI on DATED DATE:                  201.95161
    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       1.03238
    December        2          2007    208.50439       1.03245
    December        3          2007    208.51877       1.03252
    December        4          2007    208.53316       1.03259
    December        5          2007    208.54755       1.03266
    December        6          2007    208.56194       1.03273
    December        7          2007    208.57632       1.03280
    December        8          2007    208.59071       1.03287
    December        9          2007    208.60510       1.03295
    December        10         2007    208.61948       1.03302
    December        11         2007    208.63387       1.03309
    December        12         2007    208.64826       1.03316
    December        13         2007    208.66265       1.03323
    December        14         2007    208.67703       1.03330
    December        15         2007    208.69142       1.03337
    December        16         2007    208.70581       1.03344
    December        17         2007    208.72019       1.03352
    December        18         2007    208.73458       1.03359
    December        19         2007    208.74897       1.03366
    December        20         2007    208.76335       1.03373
    December        21         2007    208.77774       1.03380
    December        22         2007    208.79213       1.03387
    December        23         2007    208.80652       1.03394
    December        24         2007    208.82090       1.03401
    December        25         2007    208.83529       1.03409
    December        26         2007    208.84968       1.03416
    December        27         2007    208.86406       1.03423
    December        28         2007    208.87845       1.03430
    December        29         2007    208.89284       1.03437
    December        30         2007    208.90723       1.03444
    December        31         2007    208.92161       1.03451