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1-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2015

Ref CPI and Index Ratios for March 2008

     Contact: Office of Financing            202-504-3550
     DESCRIPTION:                            Series A-2015
     CUSIP NUMBER:                           912828DH0
     DATED DATE:                             January 15, 2005
     ORIGINAL ISSUE DATE:                    January 18, 2005
     ADDITIONAL ISSUE DATE:                  April 15, 2005
     MATURITY DATE:                          January 15, 2015
     Ref CPI on DATED DATE:                  190.94516
     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       1.09998
     March           2       2008    210.06968       1.10016
     March           3       2008    210.10335       1.10033
     March           4       2008    210.13703       1.10051
     March           5       2008    210.17071       1.10069
     March           6       2008    210.20439       1.10086
     March           7       2008    210.23806       1.10104
     March           8       2008    210.27174       1.10122
     March           9       2008    210.30542       1.10139
     March           10      2008    210.33910       1.10157
     March           11      2008    210.37277       1.10174
     March           12      2008    210.40645       1.10192
     March           13      2008    210.44013       1.10210
     March           14      2008    210.47381       1.10227
     March           15      2008    210.50748       1.10245
     March           16      2008    210.54116       1.10263
     March           17      2008    210.57484       1.10280
     March           18      2008    210.60852       1.10298
     March           19      2008    210.64219       1.10316
     March           20      2008    210.67587       1.10333
     March           21      2008    210.70955       1.10351
     March           22      2008    210.74323       1.10368
     March           23      2008    210.77690       1.10386
     March           24      2008    210.81058       1.10404
     March           25      2008    210.84426       1.10421
     March           26      2008    210.87794       1.10439
     March           27      2008    210.91161       1.10457
     March           28      2008    210.94529       1.10474
     March           29      2008    210.97897       1.10492
     March           30      2008    211.01265       1.10510
     March           31      2008    211.04632       1.10527