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1-3/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2018

Ref CPI and Index Ratios for September 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            D-2018
    CUSIP NUMBER:                           912828JE1
    DATED DATE:                             July 15, 2008
    ORIGINAL ISSUE DATE:                    July 15, 2008
    AUCTION DATE:                           July 10, 2008
    MATURITY DATE:                          July 15, 2018
    Ref CPI on DATED DATE:                  215.63997
    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       1.01472
    September      2       2008    218.85330       1.01490
    September      3       2008    218.89160       1.01508
    September      4       2008    218.92990       1.01526
    September      5       2008    218.96820       1.01543
    September      6       2008    219.00650       1.01561
    September      7       2008    219.04480       1.01579
    September      8       2008    219.08310       1.01597
    September      9       2008    219.12140       1.01614
    September      10      2008    219.15970       1.01632
    September      11      2008    219.19800       1.01650
    September      12      2008    219.23630       1.01668
    September      13      2008    219.27460       1.01686
    September      14      2008    219.31290       1.01703
    September      15      2008    219.35120       1.01721
    September      16      2008    219.38950       1.01739
    September      17      2008    219.42780       1.01757
    September      18      2008    219.46610       1.01774
    September      19      2008    219.50440       1.01792
    September      20      2008    219.54270       1.01810
    September      21      2008    219.58100       1.01828
    September      22      2008    219.61930       1.01845
    September      23      2008    219.65760       1.01863
    September      24      2008    219.69590       1.01881
    September      25      2008    219.73420       1.01899
    September      26      2008    219.77250       1.01916
    September      27      2008    219.81080       1.01934
    September      28      2008    219.84910       1.01952
    September      29      2008    219.88740       1.01970
    September      30      2008    219.92570       1.01987