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2% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2016

Ref CPI and Index Ratios for May 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            A-2016
    CUSIP NUMBER:                           912828ET3
    DATED DATE:                             January 15, 2006
    ORIGINAL ISSUE DATE:                    January 17, 2006
    ADDITIONAL ISSUE DATE:                  April 17, 2006
    MATURITY DATE:                          January 15, 2016
    Ref CPI on DATED DATE:                  198.47742
    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       1.06658
    May            2       2008    211.75219       1.06688
    May            3       2008    211.81139       1.06718
    May            4       2008    211.87058       1.06748
    May            5       2008    211.92977       1.06778
    May            6       2008    211.98897       1.06808
    May            7       2008    212.04816       1.06837
    May            8       2008    212.10735       1.06867
    May            9       2008    212.16655       1.06897
    May            10      2008    212.22574       1.06927
    May            11      2008    212.28494       1.06957
    May            12      2008    212.34413       1.06987
    May            13      2008    212.40332       1.07016
    May            14      2008    212.46252       1.07046
    May            15      2008    212.52171       1.07076
    May            16      2008    212.58090       1.07106
    May            17      2008    212.64010       1.07136
    May            18      2008    212.69929       1.07165
    May            19      2008    212.75848       1.07195
    May            20      2008    212.81768       1.07225
    May            21      2008    212.87687       1.07255
    May            22      2008    212.93606       1.07285
    May            23      2008    212.99526       1.07315
    May            24      2008    213.05445       1.07344
    May            25      2008    213.11365       1.07374
    May            26      2008    213.17284       1.07404
    May            27      2008    213.23203       1.07434
    May            28      2008    213.29123       1.07464
    May            29      2008    213.35042       1.07494
    May            30      2008    213.40961       1.07523
    May            31      2008    213.46881       1.07553