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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2015

Ref CPI and Index Ratios for September 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2015
    CUSIP NUMBER:                           912828EA4
    DATED DATE:                             July 15, 2005
    ORIGINAL ISSUE DATE:                    July 15, 2005
    ADDITIONAL ISSUE DATE:                  October 17, 2005
    MATURITY DATE:                          July 15, 2015
    Ref CPI on DATED DATE:                  194.50968
    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       1.07117
    September       2       2007    208.35023       1.07116
    September       3       2007    208.34847       1.07115
    September       4       2007    208.34670       1.07114
    September       5       2007    208.34493       1.07113
    September       6       2007    208.34317       1.07112
    September       7       2007    208.34140       1.07111
    September       8       2007    208.33963       1.07110
    September       9       2007    208.33787       1.07109
    September       10      2007    208.33610       1.07108
    September       11      2007    208.33433       1.07107
    September       12      2007    208.33257       1.07107
    September       13      2007    208.33080       1.07106
    September       14      2007    208.32903       1.07105
    September       15      2007    208.32727       1.07104
    September       16      2007    208.32550       1.07103
    September       17      2007    208.32373       1.07102
    September       18      2007    208.32197       1.07101
    September       19      2007    208.32020       1.07100
    September       20      2007    208.31843       1.07099
    September       21      2007    208.31667       1.07098
    September       22      2007    208.31490       1.07097
    September       23      2007    208.31313       1.07097
    September       24      2007    208.31137       1.07096
    September       25      2007    208.30960       1.07095
    September       26      2007    208.30783       1.07094
    September       27      2007    208.30607       1.07093
    September       28      2007    208.30430       1.07092
    September       29      2007    208.30253       1.07091
    September       30      2007    208.30077       1.07090