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

Ref CPI and Index Ratios for December 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series A-2016
    CUSIP NUMBER:                           912828ET3
    DATED DATE:                             January 15, 2006
    ORIGINAL ISSUE DATE:                    January 17, 2006
    ADDITIONAL ISSUE DATE:                  April 17, 2006
    MATURITY DATE:                          January 15, 2016
    Ref CPI on DATED DATE:                  198.47742
    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       1.05045
    December        2          2007    208.50439       1.05052
    December        3          2007    208.51877       1.05059
    December        4          2007    208.53316       1.05066
    December        5          2007    208.54755       1.05074
    December        6          2007    208.56194       1.05081
    December        7          2007    208.57632       1.05088
    December        8          2007    208.59071       1.05095
    December        9          2007    208.60510       1.05103
    December        10         2007    208.61948       1.05110
    December        11         2007    208.63387       1.05117
    December        12         2007    208.64826       1.05124
    December        13         2007    208.66265       1.05132
    December        14         2007    208.67703       1.05139
    December        15         2007    208.69142       1.05146
    December        16         2007    208.70581       1.05153
    December        17         2007    208.72019       1.05161
    December        18         2007    208.73458       1.05168
    December        19         2007    208.74897       1.05175
    December        20         2007    208.76335       1.05182
    December        21         2007    208.77774       1.05190
    December        22         2007    208.79213       1.05197
    December        23         2007    208.80652       1.05204
    December        24         2007    208.82090       1.05211
    December        25         2007    208.83529       1.05219
    December        26         2007    208.84968       1.05226
    December        27         2007    208.86406       1.05233
    December        28         2007    208.87845       1.05240
    December        29         2007    208.89284       1.05248
    December        30         2007    208.90723       1.05255
    December        31         2007    208.92161       1.05262