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2-3/8% 5-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2011

Ref CPI and Index Ratios for September 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            G-2011
    CUSIP NUMBER:                           912828FB1
    DATED DATE:                             April 15, 2006
    ORIGINAL ISSUE DATE:                    April 28, 2006
    ADDITIONAL ISSUE DATE:                  October 31, 2006
    MATURITY DATE:                          April 15, 2011
    Ref CPI on DATED DATE:                  198.48667
    TABLE FOR MONTH OF:                     September 2008
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) May 2008                    216.632
    CPI-U (NSA) June 2008                   218.815
    CPI-U (NSA) July 2008                   219.964

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    September      1       2008    218.81500       1.10242
    September      2       2008    218.85330       1.10261
    September      3       2008    218.89160       1.10280
    September      4       2008    218.92990       1.10300
    September      5       2008    218.96820       1.10319
    September      6       2008    219.00650       1.10338
    September      7       2008    219.04480       1.10357
    September      8       2008    219.08310       1.10377
    September      9       2008    219.12140       1.10396
    September      10      2008    219.15970       1.10415
    September      11      2008    219.19800       1.10435
    September      12      2008    219.23630       1.10454
    September      13      2008    219.27460       1.10473
    September      14      2008    219.31290       1.10493
    September      15      2008    219.35120       1.10512
    September      16      2008    219.38950       1.10531
    September      17      2008    219.42780       1.10550
    September      18      2008    219.46610       1.10570
    September      19      2008    219.50440       1.10589
    September      20      2008    219.54270       1.10608
    September      21      2008    219.58100       1.10628
    September      22      2008    219.61930       1.10647
    September      23      2008    219.65760       1.10666
    September      24      2008    219.69590       1.10685
    September      25      2008    219.73420       1.10705
    September      26      2008    219.77250       1.10724
    September      27      2008    219.81080       1.10743
    September      28      2008    219.84910       1.10763
    September      29      2008    219.88740       1.10782
    September      30      2008    219.92570       1.10801