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3-3/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2012

Ref CPI and Index Ratios for December 2007

     Contact: Office of Financing            202-504-3550
     DESCRIPTION:                            Series A-2012
     CUSIP NUMBER:                           9128277J5
     DATED DATE:                             January 15, 2002
     ORIGINAL ISSUE DATE:                    January 15, 2002
     ADDITIONAL ISSUE DATE:                  N/A
     MATURITY DATE:                          January 15, 2012
     Ref CPI on DATED DATE:                  177.56452
     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       1.17416
     December        2          2007    208.50439       1.17425
     December        3          2007    208.51877       1.17433
     December        4          2007    208.53316       1.17441
     December        5          2007    208.54755       1.17449
     December        6          2007    208.56194       1.17457
     December        7          2007    208.57632       1.17465
     December        8          2007    208.59071       1.17473
     December        9          2007    208.60510       1.17481
     December        10         2007    208.61948       1.17489
     December        11         2007    208.63387       1.17497
     December        12         2007    208.64826       1.17506
     December        13         2007    208.66265       1.17514
     December        14         2007    208.67703       1.17522
     December        15         2007    208.69142       1.17530
     December        16         2007    208.70581       1.17538
     December        17         2007    208.72019       1.17546
     December        18         2007    208.73458       1.17554
     December        19         2007    208.74897       1.17562
     December        20         2007    208.76335       1.17570
     December        21         2007    208.77774       1.17579
     December        22         2007    208.79213       1.17587
     December        23         2007    208.80652       1.17595
     December        24         2007    208.82090       1.17603
     December        25         2007    208.83529       1.17611
     December        26         2007    208.84968       1.17619
     December        27         2007    208.86406       1.17627
     December        28         2007    208.87845       1.17635
     December        29         2007    208.89284       1.17643
     December        30         2007    208.90723       1.17651
     December        31         2007    208.92161       1.17660