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

Ref CPI and Index Ratios for January 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series 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:                     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       1.05264
    January          2       2008    208.97603       1.05285
    January          3       2008    209.01606       1.05305
    January          4       2008    209.05610       1.05325
    January          5       2008    209.09613       1.05345
    January          6       2008    209.13616       1.05365
    January          7       2008    209.17619       1.05386
    January          8       2008    209.21623       1.05406
    January          9       2008    209.25626       1.05426
    January          10      2008    209.29629       1.05446
    January          11      2008    209.33632       1.05466
    January          12      2008    209.37635       1.05486
    January          13      2008    209.41639       1.05507
    January          14      2008    209.45642       1.05527
    January          15      2008    209.49645       1.05547
    January          16      2008    209.53648       1.05567
    January          17      2008    209.57652       1.05587
    January          18      2008    209.61655       1.05607
    January          19      2008    209.65658       1.05628
    January          20      2008    209.69661       1.05648
    January          21      2008    209.73665       1.05668
    January          22      2008    209.77668       1.05688
    January          23      2008    209.81671       1.05708
    January          24      2008    209.85674       1.05728
    January          25      2008    209.89677       1.05749
    January          26      2008    209.93681       1.05769
    January          27      2008    209.97684       1.05789
    January          28      2008    210.01687       1.05809
    January          29      2008    210.05690       1.05829
    January          30      2008    210.09694       1.05849
    January          31      2008    210.13697       1.05870