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

Ref CPI and Index Ratios for May 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:                     May 2008
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) January 2008                211.080
    CPI-U (NSA) February 2008               211.693
    CPI-U (NSA) March 2008                  213.528

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    May            1       2008    211.69300       1.08834
    May            2       2008    211.75219       1.08865
    May            3       2008    211.81139       1.08895
    May            4       2008    211.87058       1.08925
    May            5       2008    211.92977       1.08956
    May            6       2008    211.98897       1.08986
    May            7       2008    212.04816       1.09017
    May            8       2008    212.10735       1.09047
    May            9       2008    212.16655       1.09078
    May            10      2008    212.22574       1.09108
    May            11      2008    212.28494       1.09138
    May            12      2008    212.34413       1.09169
    May            13      2008    212.40332       1.09199
    May            14      2008    212.46252       1.09230
    May            15      2008    212.52171       1.09260
    May            16      2008    212.58090       1.09291
    May            17      2008    212.64010       1.09321
    May            18      2008    212.69929       1.09352
    May            19      2008    212.75848       1.09382
    May            20      2008    212.81768       1.09412
    May            21      2008    212.87687       1.09443
    May            22      2008    212.93606       1.09473
    May            23      2008    212.99526       1.09504
    May            24      2008    213.05445       1.09534
    May            25      2008    213.11365       1.09565
    May            26      2008    213.17284       1.09595
    May            27      2008    213.23203       1.09625
    May            28      2008    213.29123       1.09656
    May            29      2008    213.35042       1.09686
    May            30      2008    213.40961       1.09717
    May            31      2008    213.46881       1.09747