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3-7/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2029

Ref CPI and Index Ratios for September 2007

    Contact: Office of Financing            202-504-3550
    CUSIP NUMBER:                           912810FH6
    DATED DATE:                             April 15, 1999
    ORIGINAL ISSUE DATE:                    April 15, 1999
    ADDITIONAL ISSUE DATE:                  October 15, 1999
                                            October 16, 2000
    MATURITY DATE:                          April 15, 2029
    Ref CPI on DATED DATE:                  164.39333
    TABLE FOR MONTH OF:                     September 2007
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) May 2007                    207.949
    CPI-U (NSA) June 2007                   208.352
    CPI-U (NSA) July 2007                   208.299

    Month      Calendar Day    Year    Ref CPI       Index Ratio

    September         1        2007    208.35200       1.26740
    September         2        2007    208.35023       1.26739
    September         3        2007    208.34847       1.26738
    September         4        2007    208.34670       1.26737
    September         5        2007    208.34493       1.26736
    September         6        2007    208.34317       1.26735
    September         7        2007    208.34140       1.26733
    September         8        2007    208.33963       1.26732
    September         9        2007    208.33787       1.26731
    September         10       2007    208.33610       1.26730
    September         11       2007    208.33433       1.26729
    September         12       2007    208.33257       1.26728
    September         13       2007    208.33080       1.26727
    September         14       2007    208.32903       1.26726
    September         15       2007    208.32727       1.26725
    September         16       2007    208.32550       1.26724
    September         17       2007    208.32373       1.26723
    September         18       2007    208.32197       1.26722
    September         19       2007    208.32020       1.26721
    September         20       2007    208.31843       1.26720
    September         21       2007    208.31667       1.26718
    September         22       2007    208.31490       1.26717
    September         23       2007    208.31313       1.26716
    September         24       2007    208.31137       1.26715
    September         25       2007    208.30960       1.26714
    September         26       2007    208.30783       1.26713
    September         27       2007    208.30607       1.26712
    September         28       2007    208.30430       1.26711
    September         29       2007    208.30253       1.26710
    September         30       2007    208.30077       1.26709