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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2015

Ref CPI and Index Ratios for March 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2015
    CUSIP NUMBER:                           912828EA4
    DATED DATE:                             July 15, 2005
    ORIGINAL ISSUE DATE:                    July 15, 2005
    ADDITIONAL ISSUE DATE:                  October 17, 2005
    MATURITY DATE:                          July 15, 2015
    Ref CPI on DATED DATE:                  194.50968
    TABLE FOR MONTH OF:                     March 2008
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) November 2007               210.177
    CPI-U (NSA) December 2007               210.036
    CPI-U (NSA) January 2008                211.080

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    March           1       2008    210.03600       1.07982
    March           2       2008    210.06968       1.08000
    March           3       2008    210.10335       1.08017
    March           4       2008    210.13703       1.08034
    March           5       2008    210.17071       1.08052
    March           6       2008    210.20439       1.08069
    March           7       2008    210.23806       1.08086
    March           8       2008    210.27174       1.08103
    March           9       2008    210.30542       1.08121
    March           10      2008    210.33910       1.08138
    March           11      2008    210.37277       1.08155
    March           12      2008    210.40645       1.08173
    March           13      2008    210.44013       1.08190
    March           14      2008    210.47381       1.08207
    March           15      2008    210.50748       1.08225
    March           16      2008    210.54116       1.08242
    March           17      2008    210.57484       1.08259
    March           18      2008    210.60852       1.08277
    March           19      2008    210.64219       1.08294
    March           20      2008    210.67587       1.08311
    March           21      2008    210.70955       1.08329
    March           22      2008    210.74323       1.08346
    March           23      2008    210.77690       1.08363
    March           24      2008    210.81058       1.08381
    March           25      2008    210.84426       1.08398
    March           26      2008    210.87794       1.08415
    March           27      2008    210.91161       1.08432
    March           28      2008    210.94529       1.08450
    March           29      2008    210.97897       1.08467
    March           30      2008    211.01265       1.08484
    March           31      2008    211.04632       1.08502