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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 February 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:                     February 2007
   NUMBER OF DAYS IN MONTH:                28

   CPI-U (NSA) October 2006                201.8
   CPI-U (NSA) November 2006               201.5
   CPI-U (NSA) December 2006               201.8

   Month   Calendar Day    Year    Ref CPI       Index Ratio

   February        1       2007    201.50000       1.06363
   February        2       2007    201.51071       1.06369
   February        3       2007    201.52143       1.06375
   February        4       2007    201.53214       1.06380
   February        5       2007    201.54286       1.06386
   February        6       2007    201.55357       1.06392
   February        7       2007    201.56429       1.06397
   February        8       2007    201.57500       1.06403
   February        9       2007    201.58571       1.06408
   February        10      2007    201.59643       1.06414
   February        11      2007    201.60714       1.06420
   February        12      2007    201.61786       1.06425
   February        13      2007    201.62857       1.06431
   February        14      2007    201.63929       1.06437
   February        15      2007    201.65000       1.06442
   February        16      2007    201.66071       1.06448
   February        17      2007    201.67143       1.06454
   February        18      2007    201.68214       1.06459
   February        19      2007    201.69286       1.06465
   February        20      2007    201.70357       1.06471
   February        21      2007    201.71429       1.06476
   February        22      2007    201.72500       1.06482
   February        23      2007    201.73571       1.06488
   February        24      2007    201.74643       1.06493
   February        25      2007    201.75714       1.06499
   February        26      2007    201.76786       1.06505
   February        27      2007    201.77857       1.06510
   February        28      2007    201.78929       1.06516