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3-1/2% 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-2011
CUSIP NUMBER:                           9128276R8
DATED DATE:                             January 15, 2001
ORIGINAL ISSUE DATE:                    January 16, 2001
ADDITIONAL ISSUE DATE:                  July 16, 2001
MATURITY DATE:                          January 15, 2011
Ref CPI on DATED DATE:                  174.04516
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       1.14166
May             2       2006    198.73548       1.14186
May             3       2006    198.77097       1.14207
May             4       2006    198.80645       1.14227
May             5       2006    198.84194       1.14247
May             6       2006    198.87742       1.14268
May             7       2006    198.91290       1.14288
May             8       2006    198.94839       1.14308
May             9       2006    198.98387       1.14329
May             10      2006    199.01935       1.14349
May             11      2006    199.05484       1.14370
May             12      2006    199.09032       1.14390
May             13      2006    199.12581       1.14410
May             14      2006    199.16129       1.14431
May             15      2006    199.19677       1.14451
May             16      2006    199.23226       1.14472
May             17      2006    199.26774       1.14492
May             18      2006    199.30323       1.14512
May             19      2006    199.33871       1.14533
May             20      2006    199.37419       1.14553
May             21      2006    199.40968       1.14574
May             22      2006    199.44516       1.14594
May             23      2006    199.48065       1.14614
May             24      2006    199.51613       1.14635
May             25      2006    199.55161       1.14655
May             26      2006    199.58710       1.14675
May             27      2006    199.62258       1.14696
May             28      2006    199.65806       1.14716
May             29      2006    199.69355       1.14737
May             30      2006    199.72903       1.14757
May             31      2006    199.76452       1.14777