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2-3/8% 5-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2011

Ref CPI and Index Ratios for December 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series G-2011
    CUSIP NUMBER:                           912828FB1
    DATED DATE:                             April 15, 2006
    ORIGINAL ISSUE DATE:                    April 28, 2006
    ADDITIONAL ISSUE DATE:                  October 31, 2006
    MATURITY DATE:                          April 15, 2011
    Ref CPI on DATED DATE:                  198.48667
    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       1.05040
    December        2           2007    208.50439       1.05047
    December        3           2007    208.51877       1.05054
    December        4           2007    208.53316       1.05062
    December        5           2007    208.54755       1.05069
    December        6           2007    208.56194       1.05076
    December        7           2007    208.57632       1.05083
    December        8           2007    208.59071       1.05091
    December        9           2007    208.60510       1.05098
    December        10          2007    208.61948       1.05105
    December        11          2007    208.63387       1.05112
    December        12          2007    208.64826       1.05120
    December        13          2007    208.66265       1.05127
    December        14          2007    208.67703       1.05134
    December        15          2007    208.69142       1.05141
    December        16          2007    208.70581       1.05149
    December        17          2007    208.72019       1.05156
    December        18          2007    208.73458       1.05163
    December        19          2007    208.74897       1.05170
    December        20          2007    208.76335       1.05178
    December        21          2007    208.77774       1.05185
    December        22          2007    208.79213       1.05192
    December        23          2007    208.80652       1.05199
    December        24          2007    208.82090       1.05207
    December        25          2007    208.83529       1.05214
    December        26          2007    208.84968       1.05221
    December        27          2007    208.86406       1.05228
    December        28          2007    208.87845       1.05236
    December        29          2007    208.89284       1.05243
    December        30          2007    208.90723       1.05250
    December        31          2007    208.92161       1.05257