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2-3/8% 20-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2027

Ref CPI and Index Ratios for September 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            TIPS of January 2027
    CUSIP NUMBER:                           912810PS1
    DATED DATE:                             January 15, 2007
    ORIGINAL ISSUE DATE:                    January 31, 2007
    ADDITIONAL ISSUE DATE:                  July 31, 2007
    MATURITY DATE:                          January 15, 2027
    Ref CPI on DATED DATE:                  201.66452
    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       1.08504
    September      2       2008    218.85330       1.08523
    September      3       2008    218.89160       1.08542
    September      4       2008    218.92990       1.08561
    September      5       2008    218.96820       1.08580
    September      6       2008    219.00650       1.08599
    September      7       2008    219.04480       1.08618
    September      8       2008    219.08310       1.08637
    September      9       2008    219.12140       1.08656
    September      10      2008    219.15970       1.08675
    September      11      2008    219.19800       1.08694
    September      12      2008    219.23630       1.08713
    September      13      2008    219.27460       1.08732
    September      14      2008    219.31290       1.08751
    September      15      2008    219.35120       1.08770
    September      16      2008    219.38950       1.08789
    September      17      2008    219.42780       1.08808
    September      18      2008    219.46610       1.08827
    September      19      2008    219.50440       1.08846
    September      20      2008    219.54270       1.08865
    September      21      2008    219.58100       1.08884
    September      22      2008    219.61930       1.08903
    September      23      2008    219.65760       1.08922
    September      24      2008    219.69590       1.08941
    September      25      2008    219.73420       1.08960
    September      26      2008    219.77250       1.08979
    September      27      2008    219.81080       1.08998
    September      28      2008    219.84910       1.09017
    September      29      2008    219.88740       1.09036
    September      30      2008    219.92570       1.09055