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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 April 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:                     April 2007
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) December 2006               201.8
    CPI-U (NSA) January 2007                202.416
    CPI-U (NSA) February 2007               203.499

    Month   Calendar Day   Year    Ref CPI       Index Ratio

    April          1       2007    202.41600       1.06847
    April          2       2007    202.45210       1.06866
    April          3       2007    202.48820       1.06885
    April          4       2007    202.52430       1.06904
    April          5       2007    202.56040       1.06923
    April          6       2007    202.59650       1.06942
    April          7       2007    202.63260       1.06961
    April          8       2007    202.66870       1.06980
    April          9       2007    202.70480       1.06999
    April          10      2007    202.74090       1.07018
    April          11      2007    202.77700       1.07037
    April          12      2007    202.81310       1.07056
    April          13      2007    202.84920       1.07075
    April          14      2007    202.88530       1.07094
    April          15      2007    202.92140       1.07114
    April          16      2007    202.95750       1.07133
    April          17      2007    202.99360       1.07152
    April          18      2007    203.02970       1.07171
    April          19      2007    203.06580       1.07190
    April          20      2007    203.10190       1.07209
    April          21      2007    203.13800       1.07228
    April          22      2007    203.17410       1.07247
    April          23      2007    203.21020       1.07266
    April          24      2007    203.24630       1.07285
    April          25      2007    203.28240       1.07304
    April          26      2007    203.31850       1.07323
    April          27      2007    203.35460       1.07342
    April          28      2007    203.39070       1.07361
    April          29      2007    203.42680       1.07380
    April          30      2007    203.46290       1.07399