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3-7/8% 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-2009
CUSIP NUMBER:                           9128274Y5
DATED DATE:                             January 15, 1999
ORIGINAL ISSUE DATE:                    January 15, 1999
ADDITIONAL ISSUE DATE:                  July 15, 1999
MATURITY DATE:                          January 15, 2009
Ref CPI on DATED DATE:                  164.00000
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       1.21159
May             2       2006    198.73548       1.21180
May             3       2006    198.77097       1.21202
May             4       2006    198.80645       1.21223
May             5       2006    198.84194       1.21245
May             6       2006    198.87742       1.21267
May             7       2006    198.91290       1.21288
May             8       2006    198.94839       1.21310
May             9       2006    198.98387       1.21332
May             10      2006    199.01935       1.21353
May             11      2006    199.05484       1.21375
May             12      2006    199.09032       1.21397
May             13      2006    199.12581       1.21418
May             14      2006    199.16129       1.21440
May             15      2006    199.19677       1.21461
May             16      2006    199.23226       1.21483
May             17      2006    199.26774       1.21505
May             18      2006    199.30323       1.21526
May             19      2006    199.33871       1.21548
May             20      2006    199.37419       1.21570
May             21      2006    199.40968       1.21591
May             22      2006    199.44516       1.21613
May             23      2006    199.48065       1.21635
May             24      2006    199.51613       1.21656
May             25      2006    199.55161       1.21678
May             26      2006    199.58710       1.21699
May             27      2006    199.62258       1.21721
May             28      2006    199.65806       1.21743
May             29      2006    199.69355       1.21764
May             30      2006    199.72903       1.21786
May             31      2006    199.76452       1.21808