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1-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for May 2006

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:                     May 2006
NUMBER OF DAYS IN MONTH:                31

CPI-U (NSA) January 2006                198.3
CPI-U (NSA) February 2006               198.7
CPI-U (NSA) March 2006                  199.8

Month   Calendar Day    Year    Ref CPI       Index Ratio

May             1       2006    198.70000       1.04061
May             2       2006    198.73548       1.04080
May             3       2006    198.77097       1.04098
May             4       2006    198.80645       1.04117
May             5       2006    198.84194       1.04136
May             6       2006    198.87742       1.04154
May             7       2006    198.91290       1.04173
May             8       2006    198.94839       1.04191
May             9       2006    198.98387       1.04210
May             10      2006    199.01935       1.04229
May             11      2006    199.05484       1.04247
May             12      2006    199.09032       1.04266
May             13      2006    199.12581       1.04284
May             14      2006    199.16129       1.04303
May             15      2006    199.19677       1.04321
May             16      2006    199.23226       1.04340
May             17      2006    199.26774       1.04359
May             18      2006    199.30323       1.04377
May             19      2006    199.33871       1.04396
May             20      2006    199.37419       1.04414
May             21      2006    199.40968       1.04433
May             22      2006    199.44516       1.04452
May             23      2006    199.48065       1.04470
May             24      2006    199.51613       1.04489
May             25      2006    199.55161       1.04507
May             26      2006    199.58710       1.04526
May             27      2006    199.62258       1.04544
May             28      2006    199.65806       1.04563
May             29      2006    199.69355       1.04582
May             30      2006    199.72903       1.04600
May             31      2006    199.76452       1.04619