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3-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2008

Ref CPI and Index Ratios for October 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series A-2008
    CUSIP NUMBER:                           9128273T7
    DATED DATE:                             January 15, 1998
    ORIGINAL ISSUE DATE:                    January 15, 1998
    ADDITIONAL ISSUE DATE:                  October 15, 1998
    MATURITY DATE:                          January 15, 2008
    Ref CPI on DATED DATE:                  161.55484
    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       1.28934
    October         2       2007    208.28668       1.28926
    October         3       2007    208.27435       1.28919
    October         4       2007    208.26203       1.28911
    October         5       2007    208.24971       1.28903
    October         6       2007    208.23739       1.28896
    October         7       2007    208.22506       1.28888
    October         8       2007    208.21274       1.28881
    October         9       2007    208.20042       1.28873
    October         10      2007    208.18810       1.28865
    October         11      2007    208.17577       1.28858
    October         12      2007    208.16345       1.28850
    October         13      2007    208.15113       1.28842
    October         14      2007    208.13881       1.28835
    October         15      2007    208.12648       1.28827
    October         16      2007    208.11416       1.28820
    October         17      2007    208.10184       1.28812
    October         18      2007    208.08952       1.28804
    October         19      2007    208.07719       1.28797
    October         20      2007    208.06487       1.28789
    October         21      2007    208.05255       1.28781
    October         22      2007    208.04023       1.28774
    October         23      2007    208.02790       1.28766
    October         24      2007    208.01558       1.28758
    October         25      2007    208.00326       1.28751
    October         26      2007    207.99094       1.28743
    October         27      2007    207.97861       1.28736
    October         28      2007    207.96629       1.28728
    October         29      2007    207.95397       1.28720
    October         30      2007    207.94165       1.28713
    October         31      2007    207.92932       1.28705