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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 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            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 2008
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) May 2008                    216.632
    CPI-U (NSA) June 2008                   218.815
    CPI-U (NSA) July 2008                   219.964

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    September      1       2008    218.81500       1.12496
    September      2       2008    218.85330       1.12515
    September      3       2008    218.89160       1.12535
    September      4       2008    218.92990       1.12555
    September      5       2008    218.96820       1.12574
    September      6       2008    219.00650       1.12594
    September      7       2008    219.04480       1.12614
    September      8       2008    219.08310       1.12634
    September      9       2008    219.12140       1.12653
    September      10      2008    219.15970       1.12673
    September      11      2008    219.19800       1.12693
    September      12      2008    219.23630       1.12712
    September      13      2008    219.27460       1.12732
    September      14      2008    219.31290       1.12752
    September      15      2008    219.35120       1.12771
    September      16      2008    219.38950       1.12791
    September      17      2008    219.42780       1.12811
    September      18      2008    219.46610       1.12830
    September      19      2008    219.50440       1.12850
    September      20      2008    219.54270       1.12870
    September      21      2008    219.58100       1.12889
    September      22      2008    219.61930       1.12909
    September      23      2008    219.65760       1.12929
    September      24      2008    219.69590       1.12949
    September      25      2008    219.73420       1.12968
    September      26      2008    219.77250       1.12988
    September      27      2008    219.81080       1.13008
    September      28      2008    219.84910       1.13027
    September      29      2008    219.88740       1.13047
    September      30      2008    219.92570       1.13067