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3-5/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for May 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            TIPS of April 2028
CUSIP NUMBER:                           912810FD5
DATED DATE:                             April 15, 1998
ORIGINAL ISSUE DATE:                    April 15, 1998
ADDITIONAL ISSUE DATE:                  July 15, 1998
MATURITY DATE:                          April 15, 2028
Ref CPI on DATED DATE:                  161.74000
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       1.22851
May             2       2006    198.73548       1.22873
May             3       2006    198.77097       1.22895
May             4       2006    198.80645       1.22917
May             5       2006    198.84194       1.22939
May             6       2006    198.87742       1.22961
May             7       2006    198.91290       1.22983
May             8       2006    198.94839       1.23005
May             9       2006    198.98387       1.23027
May             10      2006    199.01935       1.23049
May             11      2006    199.05484       1.23071
May             12      2006    199.09032       1.23093
May             13      2006    199.12581       1.23115
May             14      2006    199.16129       1.23137
May             15      2006    199.19677       1.23159
May             16      2006    199.23226       1.23181
May             17      2006    199.26774       1.23203
May             18      2006    199.30323       1.23224
May             19      2006    199.33871       1.23246
May             20      2006    199.37419       1.23268
May             21      2006    199.40968       1.23290
May             22      2006    199.44516       1.23312
May             23      2006    199.48065       1.23334
May             24      2006    199.51613       1.23356
May             25      2006    199.55161       1.23378
May             26      2006    199.58710       1.23400
May             27      2006    199.62258       1.23422
May             28      2006    199.65806       1.23444
May             29      2006    199.69355       1.23466
May             30      2006    199.72903       1.23488
May             31      2006    199.76452       1.23510