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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 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series 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 2007
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) January 2007                202.416
    CPI-U (NSA) February 2007               203.499
    CPI-U (NSA) March 2007                  205.352

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    May             1       2007    203.49900       1.00766
    May             2       2007    203.55877       1.00796
    May             3       2007    203.61855       1.00825
    May             4       2007    203.67832       1.00855
    May             5       2007    203.73810       1.00885
    May             6       2007    203.79787       1.00914
    May             7       2007    203.85765       1.00944
    May             8       2007    203.91742       1.00973
    May             9       2007    203.97719       1.01003
    May             10      2007    204.03697       1.01033
    May             11      2007    204.09674       1.01062
    May             12      2007    204.15652       1.01092
    May             13      2007    204.21629       1.01121
    May             14      2007    204.27606       1.01151
    May             15      2007    204.33584       1.01181
    May             16      2007    204.39561       1.01210
    May             17      2007    204.45539       1.01240
    May             18      2007    204.51516       1.01269
    May             19      2007    204.57494       1.01299
    May             20      2007    204.63471       1.01329
    May             21      2007    204.69448       1.01358
    May             22      2007    204.75426       1.01388
    May             23      2007    204.81403       1.01417
    May             24      2007    204.87381       1.01447
    May             25      2007    204.93358       1.01477
    May             26      2007    204.99335       1.01506
    May             27      2007    205.05313       1.01536
    May             28      2007    205.11290       1.01565
    May             29      2007    205.17268       1.01595
    May             30      2007    205.23245       1.01625
    May             31      2007    205.29223       1.01654