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2% 5-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2012

Ref CPI and Index Ratios for January 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series J-2012
    CUSIP NUMBER:                           912828GN4
    DATED DATE:                             April 15, 2007
    ORIGINAL ISSUE DATE:                    April 30, 2007
    ADDITIONAL ISSUE DATE:                  October 31, 2007
    MATURITY DATE:                          April 15, 2012
    Ref CPI on DATED DATE:                  202.92140
    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       1.02964
    January         2       2008    208.97603       1.02984
    January         3       2008    209.01606       1.03003
    January         4       2008    209.05610       1.03023
    January         5       2008    209.09613       1.03043
    January         6       2008    209.13616       1.03063
    January         7       2008    209.17619       1.03082
    January         8       2008    209.21623       1.03102
    January         9       2008    209.25626       1.03122
    January         10      2008    209.29629       1.03142
    January         11      2008    209.33632       1.03161
    January         12      2008    209.37635       1.03181
    January         13      2008    209.41639       1.03201
    January         14      2008    209.45642       1.03220
    January         15      2008    209.49645       1.03240
    January         16      2008    209.53648       1.03260
    January         17      2008    209.57652       1.03280
    January         18      2008    209.61655       1.03299
    January         19      2008    209.65658       1.03319
    January         20      2008    209.69661       1.03339
    January         21      2008    209.73665       1.03359
    January         22      2008    209.77668       1.03378
    January         23      2008    209.81671       1.03398
    January         24      2008    209.85674       1.03418
    January         25      2008    209.89677       1.03437
    January         26      2008    209.93681       1.03457
    January         27      2008    209.97684       1.03477
    January         28      2008    210.01687       1.03497
    January         29      2008    210.05690       1.03516
    January         30      2008    210.09694       1.03536
    January         31      2008    210.13697       1.03556