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3-3/8% 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-2007
CUSIP NUMBER:                           9128272M3
DATED DATE:                             January 15, 1997
ORIGINAL ISSUE DATE:                    February 6, 1997
ADDITIONAL ISSUE DATE:                  April 15, 1997
MATURITY DATE:                          January 15, 2007
Ref CPI on DATED DATE:                  158.43548
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       1.25414
May             2       2006    198.73548       1.25436
May             3       2006    198.77097       1.25459
May             4       2006    198.80645       1.25481
May             5       2006    198.84194       1.25503
May             6       2006    198.87742       1.25526
May             7       2006    198.91290       1.25548
May             8       2006    198.94839       1.25571
May             9       2006    198.98387       1.25593
May             10      2006    199.01935       1.25615
May             11      2006    199.05484       1.25638
May             12      2006    199.09032       1.25660
May             13      2006    199.12581       1.25683
May             14      2006    199.16129       1.25705
May             15      2006    199.19677       1.25727
May             16      2006    199.23226       1.25750
May             17      2006    199.26774       1.25772
May             18      2006    199.30323       1.25795
May             19      2006    199.33871       1.25817
May             20      2006    199.37419       1.25839
May             21      2006    199.40968       1.25862
May             22      2006    199.44516       1.25884
May             23      2006    199.48065       1.25907
May             24      2006    199.51613       1.25929
May             25      2006    199.55161       1.25951
May             26      2006    199.58710       1.25974
May             27      2006    199.62258       1.25996
May             28      2006    199.65806       1.26019
May             29      2006    199.69355       1.26041
May             30      2006    199.72903       1.26063
May             31      2006    199.76452       1.26086