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1-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2015

Ref CPI and Index Ratios for December 2007

     Contact: Office of Financing            202-504-3550
     DESCRIPTION:                            Series A-2015
     CUSIP NUMBER:                           912828DH0
     DATED DATE:                             January 15, 2005
     ORIGINAL ISSUE DATE:                    January 18, 2005
     ADDITIONAL ISSUE DATE:                  April 15, 2005
     MATURITY DATE:                          January 15, 2015
     Ref CPI on DATED DATE:                  190.94516
     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       1.09188
     December        2          2007    208.50439       1.09196
     December        3          2007    208.51877       1.09203
     December        4          2007    208.53316       1.09211
     December        5          2007    208.54755       1.09219
     December        6          2007    208.56194       1.09226
     December        7          2007    208.57632       1.09234
     December        8          2007    208.59071       1.09241
     December        9          2007    208.60510       1.09249
     December        10         2007    208.61948       1.09256
     December        11         2007    208.63387       1.09264
     December        12         2007    208.64826       1.09271
     December        13         2007    208.66265       1.09279
     December        14         2007    208.67703       1.09286
     December        15         2007    208.69142       1.09294
     December        16         2007    208.70581       1.09301
     December        17         2007    208.72019       1.09309
     December        18         2007    208.73458       1.09317
     December        19         2007    208.74897       1.09324
     December        20         2007    208.76335       1.09332
     December        21         2007    208.77774       1.09339
     December        22         2007    208.79213       1.09347
     December        23         2007    208.80652       1.09354
     December        24         2007    208.82090       1.09362
     December        25         2007    208.83529       1.09369
     December        26         2007    208.84968       1.09377
     December        27         2007    208.86406       1.09384
     December        28         2007    208.87845       1.09392
     December        29         2007    208.89284       1.09399
     December        30         2007    208.90723       1.09407
     December        31         2007    208.92161       1.09414