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3-5/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2028

Ref CPI and Index Ratios for May 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            TIPS of April 2028
    CUSIP NUMBER:                           912810FD5
    DATED DATE:                             April 15, 1998
    ORIGINAL ISSUE DATE:                    April 15, 1998
    ADDITIONAL ISSUE DATE:                  July 15, 1998
    MATURITY DATE:                          April 15, 2028
    Ref CPI on DATED DATE:                  161.74000
    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       1.30885
    May            2       2008    211.75219       1.30921
    May            3       2008    211.81139       1.30958
    May            4       2008    211.87058       1.30995
    May            5       2008    211.92977       1.31031
    May            6       2008    211.98897       1.31068
    May            7       2008    212.04816       1.31104
    May            8       2008    212.10735       1.31141
    May            9       2008    212.16655       1.31178
    May            10      2008    212.22574       1.31214
    May            11      2008    212.28494       1.31251
    May            12      2008    212.34413       1.31287
    May            13      2008    212.40332       1.31324
    May            14      2008    212.46252       1.31361
    May            15      2008    212.52171       1.31397
    May            16      2008    212.58090       1.31434
    May            17      2008    212.64010       1.31470
    May            18      2008    212.69929       1.31507
    May            19      2008    212.75848       1.31544
    May            20      2008    212.81768       1.31580
    May            21      2008    212.87687       1.31617
    May            22      2008    212.93606       1.31653
    May            23      2008    212.99526       1.31690
    May            24      2008    213.05445       1.31727
    May            25      2008    213.11365       1.31763
    May            26      2008    213.17284       1.31800
    May            27      2008    213.23203       1.31836
    May            28      2008    213.29123       1.31873
    May            29      2008    213.35042       1.31909
    May            30      2008    213.40961       1.31946
    May            31      2008    213.46881       1.31983