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

Ref CPI and Index Ratios for July 2006

    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:               July 2006
   NUMBER OF DAYS IN MONTH:          31

   CPI-U (NSA) March 2006            199.8
   CPI-U (NSA) April 2006            201.5
   CPI-U (NSA) May 2006              202.5

   Month   Calendar Day    Year    Ref CPI       Index Ratio

   July            1       2006    201.50000       1.09711
   July            2       2006    201.53226       1.09728
   July            3       2006    201.56452       1.09746
   July            4       2006    201.59677       1.09764
   July            5       2006    201.62903       1.09781
   July            6       2006    201.66129       1.09799
   July            7       2006    201.69355       1.09816
   July            8       2006    201.72581       1.09834
   July            9       2006    201.75806       1.09851
   July            10      2006    201.79032       1.09869
   July            11      2006    201.82258       1.09887
   July            12      2006    201.85484       1.09904
   July            13      2006    201.88710       1.09922
   July            14      2006    201.91935       1.09939
   July            15      2006    201.95161       1.09957
   July            16      2006    201.98387       1.09974
   July            17      2006    202.01613       1.09992
   July            18      2006    202.04839       1.10009
   July            19      2006    202.08065       1.10027
   July            20      2006    202.11290       1.10045
   July            21      2006    202.14516       1.10062
   July            22      2006    202.17742       1.10080
   July            23      2006    202.20968       1.10097
   July            24      2006    202.24194       1.10115
   July            25      2006    202.27419       1.10132
   July            26      2006    202.30645       1.10150
   July            27      2006    202.33871       1.10168
   July            28      2006    202.37097       1.10185
   July            29      2006    202.40323       1.10203
   July            30      2006    202.43548       1.10220
   July            31      2006    202.46774       1.10238