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1-1/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2021

Ref CPI and Index Ratios for December 2011

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            A-2021
    CUSIP NUMBER:                           912828PP9
    DATED DATE:                             January 15, 2011
    ORIGINAL ISSUE DATE:                    January 31, 2011
    ADDITIONAL ISSUE DATE:                  March 31, 2011
                                            May 31, 2011
    MATURITY DATE:                          January 15, 2021
    Ref CPI on DATED DATE:                  218.75255
    TABLE FOR MONTH OF:                     December 2011
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) August 2011                 226.545
    CPI-U (NSA) September 2011              226.889
    CPI-U (NSA) October 2011                226.421

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    December       1       2011    226.88900       1.03719
    December       2       2011    226.87390       1.03713
    December       3       2011    226.85881       1.03706
    December       4       2011    226.84371       1.03699
    December       5       2011    226.82861       1.03692
    December       6       2011    226.81352       1.03685
    December       7       2011    226.79842       1.03678
    December       8       2011    226.78332       1.03671
    December       9       2011    226.76823       1.03664
    December       10      2011    226.75313       1.03657
    December       11      2011    226.73803       1.03650
    December       12      2011    226.72294       1.03644
    December       13      2011    226.70784       1.03637
    December       14      2011    226.69274       1.03630
    December       15      2011    226.67765       1.03623
    December       16      2011    226.66255       1.03616
    December       17      2011    226.64745       1.03609
    December       18      2011    226.63235       1.03602
    December       19      2011    226.61726       1.03595
    December       20      2011    226.60216       1.03588
    December       21      2011    226.58706       1.03581
    December       22      2011    226.57197       1.03575
    December       23      2011    226.55687       1.03568
    December       24      2011    226.54177       1.03561
    December       25      2011    226.52668       1.03554
    December       26      2011    226.51158       1.03547
    December       27      2011    226.49648       1.03540
    December       28      2011    226.48139       1.03533
    December       29      2011    226.46629       1.03526
    December       30      2011    226.45119       1.03519
    December       31      2011    226.43610       1.03512