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

Ref CPI and Index Ratios for October 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:                     October 2007
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) June 2007                   208.352
    CPI-U (NSA) July 2007                   208.299
    CPI-U (NSA) August 2007                 207.917

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    October         1       2007    208.29900       1.07089
    October         2       2007    208.28668       1.07083
    October         3       2007    208.27435       1.07077
    October         4       2007    208.26203       1.07070
    October         5       2007    208.24971       1.07064
    October         6       2007    208.23739       1.07058
    October         7       2007    208.22506       1.07051
    October         8       2007    208.21274       1.07045
    October         9       2007    208.20042       1.07039
    October         10      2007    208.18810       1.07032
    October         11      2007    208.17577       1.07026
    October         12      2007    208.16345       1.07020
    October         13      2007    208.15113       1.07013
    October         14      2007    208.13881       1.07007
    October         15      2007    208.12648       1.07001
    October         16      2007    208.11416       1.06994
    October         17      2007    208.10184       1.06988
    October         18      2007    208.08952       1.06982
    October         19      2007    208.07719       1.06975
    October         20      2007    208.06487       1.06969
    October         21      2007    208.05255       1.06963
    October         22      2007    208.04023       1.06956
    October         23      2007    208.02790       1.06950
    October         24      2007    208.01558       1.06944
    October         25      2007    208.00326       1.06937
    October         26      2007    207.99094       1.06931
    October         27      2007    207.97861       1.06925
    October         28      2007    207.96629       1.06918
    October         29      2007    207.95397       1.06912
    October         30      2007    207.94165       1.06906
    October         31      2007    207.92932       1.06899