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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2015

Ref CPI and Index Ratios for March 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2015
    CUSIP NUMBER:                           912828EA4
    DATED DATE:                             July 15, 2005
    ORIGINAL ISSUE DATE:                    July 15, 2005
    ADDITIONAL ISSUE DATE:                  October 17, 2005
    MATURITY DATE:                          July 15, 2015
    Ref CPI on DATED DATE:                  194.50968
    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       1.03748
    March           2       2007    201.81987       1.03758
    March           3       2007    201.83974       1.03768
    March           4       2007    201.85961       1.03779
    March           5       2007    201.87948       1.03789
    March           6       2007    201.89935       1.03799
    March           7       2007    201.91923       1.03809
    March           8       2007    201.93910       1.03820
    March           9       2007    201.95897       1.03830
    March           10      2007    201.97884       1.03840
    March           11      2007    201.99871       1.03850
    March           12      2007    202.01858       1.03860
    March           13      2007    202.03845       1.03871
    March           14      2007    202.05832       1.03881
    March           15      2007    202.07819       1.03891
    March           16      2007    202.09806       1.03901
    March           17      2007    202.11794       1.03912
    March           18      2007    202.13781       1.03922
    March           19      2007    202.15768       1.03932
    March           20      2007    202.17755       1.03942
    March           21      2007    202.19742       1.03952
    March           22      2007    202.21729       1.03963
    March           23      2007    202.23716       1.03973
    March           24      2007    202.25703       1.03983
    March           25      2007    202.27690       1.03993
    March           26      2007    202.29677       1.04003
    March           27      2007    202.31665       1.04014
    March           28      2007    202.33652       1.04024
    March           29      2007    202.35639       1.04034
    March           30      2007    202.37626       1.04044
    March           31      2007    202.39613       1.04055