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2-1/2% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2016

Ref CPI and Index Ratios for May 2010

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            D-2016
    CUSIP NUMBER:                           912828FL9
    DATED DATE:                             July 15, 2006
    ORIGINAL ISSUE DATE:                    July 17, 2006
    ADDITIONAL ISSUE DATE:                  October 16, 2006
    MATURITY DATE:                          July 15, 2016
    Ref CPI on DATED DATE:                  201.95161
    TABLE FOR MONTH OF:                     May 2010
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) January 2010                216.687
    CPI-U (NSA) February 2010               216.741
    CPI-U (NSA) March 2010                  217.631

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    May            1       2010    216.74100       1.07323
    May            2       2010    216.76971       1.07337
    May            3       2010    216.79842       1.07352
    May            4       2010    216.82713       1.07366
    May            5       2010    216.85584       1.07380
    May            6       2010    216.88455       1.07394
    May            7       2010    216.91326       1.07409
    May            8       2010    216.94197       1.07423
    May            9       2010    216.97068       1.07437
    May            10      2010    216.99939       1.07451
    May            11      2010    217.02810       1.07465
    May            12      2010    217.05681       1.07480
    May            13      2010    217.08552       1.07494
    May            14      2010    217.11423       1.07508
    May            15      2010    217.14294       1.07522
    May            16      2010    217.17165       1.07536
    May            17      2010    217.20035       1.07551
    May            18      2010    217.22906       1.07565
    May            19      2010    217.25777       1.07579
    May            20      2010    217.28648       1.07593
    May            21      2010    217.31519       1.07608
    May            22      2010    217.34390       1.07622
    May            23      2010    217.37261       1.07636
    May            24      2010    217.40132       1.07650
    May            25      2010    217.43003       1.07664
    May            26      2010    217.45874       1.07679
    May            27      2010    217.48745       1.07693
    May            28      2010    217.51616       1.07707
    May            29      2010    217.54487       1.07721
    May            30      2010    217.57358       1.07736
    May            31      2010    217.60229       1.07750