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2-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2017

Ref CPI and Index Ratios for January 2008

    Contact: Office of Financing            202-504-3550

    DESCRIPTION:                            Series D-2017
    CUSIP NUMBER:                           912828GX2
    DATED DATE:                             July 15, 2007
    ORIGINAL ISSUE DATE:                    July 16, 2007
    ADDITIONAL ISSUE DATE:                  October 15, 2007
    MATURITY DATE:                          July 15, 2017
    Ref CPI on DATED DATE:                  207.25639
    TABLE FOR MONTH OF:                     January 2008
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) September 2007              208.490
    CPI-U (NSA) October 2007                208.936
    CPI-U (NSA) November 2007               210.177

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    January         1       2008    208.93600       1.00810
    January         2       2008    208.97603       1.00830
    January         3       2008    209.01606       1.00849
    January         4       2008    209.05610       1.00868
    January         5       2008    209.09613       1.00888
    January         6       2008    209.13616       1.00907
    January         7       2008    209.17619       1.00926
    January         8       2008    209.21623       1.00946
    January         9       2008    209.25626       1.00965
    January         10      2008    209.29629       1.00984
    January         11      2008    209.33632       1.01004
    January         12      2008    209.37635       1.01023
    January         13      2008    209.41639       1.01042
    January         14      2008    209.45642       1.01062
    January         15      2008    209.49645       1.01081
    January         16      2008    209.53648       1.01100
    January         17      2008    209.57652       1.01119
    January         18      2008    209.61655       1.01139
    January         19      2008    209.65658       1.01158
    January         20      2008    209.69661       1.01177
    January         21      2008    209.73665       1.01197
    January         22      2008    209.77668       1.01216
    January         23      2008    209.81671       1.01235
    January         24      2008    209.85674       1.01255
    January         25      2008    209.89677       1.01274
    January         26      2008    209.93681       1.01293
    January         27      2008    209.97684       1.01313
    January         28      2008    210.01687       1.01332
    January         29      2008    210.05690       1.01351
    January         30      2008    210.09694       1.01371
    January         31      2008    210.13697       1.01390