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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2013

Ref CPI and Index Ratios for May 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series C-2013
    CUSIP NUMBER:                           912828BD1
    DATED DATE:                             July 15, 2003
    ORIGINAL ISSUE DATE:                    July 15, 2003
    ADDITIONAL ISSUE DATE:                  October 15, 2003
    MATURITY DATE:                          July 15, 2013
    Ref CPI on DATED DATE:                  183.66452
    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       1.10799
    May             2       2007    203.55877       1.10832
    May             3       2007    203.61855       1.10864
    May             4       2007    203.67832       1.10897
    May             5       2007    203.73810       1.10929
    May             6       2007    203.79787       1.10962
    May             7       2007    203.85765       1.10995
    May             8       2007    203.91742       1.11027
    May             9       2007    203.97719       1.11060
    May             10      2007    204.03697       1.11092
    May             11      2007    204.09674       1.11125
    May             12      2007    204.15652       1.11157
    May             13      2007    204.21629       1.11190
    May             14      2007    204.27606       1.11222
    May             15      2007    204.33584       1.11255
    May             16      2007    204.39561       1.11287
    May             17      2007    204.45539       1.11320
    May             18      2007    204.51516       1.11353
    May             19      2007    204.57494       1.11385
    May             20      2007    204.63471       1.11418
    May             21      2007    204.69448       1.11450
    May             22      2007    204.75426       1.11483
    May             23      2007    204.81403       1.11515
    May             24      2007    204.87381       1.11548
    May             25      2007    204.93358       1.11580
    May             26      2007    204.99335       1.11613
    May             27      2007    205.05313       1.11645
    May             28      2007    205.11290       1.11678
    May             29      2007    205.17268       1.11711
    May             30      2007    205.23245       1.11743
    May             31      2007    205.29223       1.11776