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0-7/8% 5-1/2-YEAR TREASURY INFLATION-PROTECTED SECURITIES Due April 15, 2010

Ref CPI and Index Ratios for March 2007

   Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2010
    CUSIP NUMBER:                           912828CZ1
    DATED DATE:                             October 15, 2004
    ORIGINAL ISSUE DATE:                    October 29, 2004
    ADDITIONAL ISSUE DATE:                  April 29, 2005
                                            October 28, 2005
    MATURITY DATE:                          April 15, 2010
    Ref CPI on DATED DATE:                  189.44516
    TABLE FOR MONTH OF:                     March 2007
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) November 2006               201.5
    CPI-U (NSA) December 2006               201.8
    CPI-U (NSA) January 2007                202.416

    Month    Calendar Day   Year    Ref CPI       Index Ratio

    March           1       2007    201.80000       1.06522
    March           2       2007    201.81987       1.06532
    March           3       2007    201.83974       1.06543
    March           4       2007    201.85961       1.06553
    March           5       2007    201.87948       1.06564
    March           6       2007    201.89935       1.06574
    March           7       2007    201.91923       1.06585
    March           8       2007    201.93910       1.06595
    March           9       2007    201.95897       1.06606
    March           10      2007    201.97884       1.06616
    March           11      2007    201.99871       1.06626
    March           12      2007    202.01858       1.06637
    March           13      2007    202.03845       1.06647
    March           14      2007    202.05832       1.06658
    March           15      2007    202.07819       1.06668
    March           16      2007    202.09806       1.06679
    March           17      2007    202.11794       1.06689
    March           18      2007    202.13781       1.06700
    March           19      2007    202.15768       1.06710
    March           20      2007    202.17755       1.06721
    March           21      2007    202.19742       1.06731
    March           22      2007    202.21729       1.06742
    March           23      2007    202.23716       1.06752
    March           24      2007    202.25703       1.06763
    March           25      2007    202.27690       1.06773
    March           26      2007    202.29677       1.06784
    March           27      2007    202.31665       1.06794
    March           28      2007    202.33652       1.06805
    March           29      2007    202.35639       1.06815
    March           30      2007    202.37626       1.06826
    March           31      2007    202.39613       1.06836