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2-3/8% 5-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2011

Ref CPI and Index Ratios for May 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            G-2011
    CUSIP NUMBER:                           912828FB1
    DATED DATE:                             April 15, 2006
    ORIGINAL ISSUE DATE:                    April 28, 2006
    ADDITIONAL ISSUE DATE:                  October 31, 2006
    MATURITY DATE:                          April 15, 2011
    Ref CPI on DATED DATE:                  198.48667
    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       1.06654
    May            2       2008    211.75219       1.06683
    May            3       2008    211.81139       1.06713
    May            4       2008    211.87058       1.06743
    May            5       2008    211.92977       1.06773
    May            6       2008    211.98897       1.06803
    May            7       2008    212.04816       1.06832
    May            8       2008    212.10735       1.06862
    May            9       2008    212.16655       1.06892
    May            10      2008    212.22574       1.06922
    May            11      2008    212.28494       1.06952
    May            12      2008    212.34413       1.06982
    May            13      2008    212.40332       1.07011
    May            14      2008    212.46252       1.07041
    May            15      2008    212.52171       1.07071
    May            16      2008    212.58090       1.07101
    May            17      2008    212.64010       1.07131
    May            18      2008    212.69929       1.07160
    May            19      2008    212.75848       1.07190
    May            20      2008    212.81768       1.07220
    May            21      2008    212.87687       1.07250
    May            22      2008    212.93606       1.07280
    May            23      2008    212.99526       1.07310
    May            24      2008    213.05445       1.07339
    May            25      2008    213.11365       1.07369
    May            26      2008    213.17284       1.07399
    May            27      2008    213.23203       1.07429
    May            28      2008    213.29123       1.07459
    May            29      2008    213.35042       1.07489
    May            30      2008    213.40961       1.07518
    May            31      2008    213.46881       1.07548