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The Standard & Poor's/Investortools - Investment Grade Index
October 2011
(Expanded Deletion Criteria)
See Explanation
Cumulative Returns Data

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Period # Of
Cusips		 Total
Return		 Beg. Mkt.
Val (Mil)		 Mkt. Wt.
Coupon 		Mkt. Wt.
Beginning Yield		 Mkt. Wt.
Ending Yield		 Ending Mod
Duration		 Ending Yrs. To
Price Date
October 2011 53,274 -0.358% 1,198,834 4.995% 3.074% 3.192% 5.14 6.92
One Year History
(Indices and data produced before November 2002 reflect the original limited deletion criteria.)
Period # Of
Cusips		 Total
Return		 Beg. Mkt.
Val (Mil)		 Mkt. Wt.
Coupon 		Mkt. Wt.
Beginning Yield		 Mkt. Wt.
Ending Yield		 Ending Mod
Duration		 Ending Yrs. To
Price Date
Sep 2011 53,252 1.116% 1,192,586 5.003% 3.208% 3.104% 5.09 6.80
Aug 2011 52,713 1.489% 1,172,139 5.007% 3.428% 3.206% 5.37 7.49
Jul 2011 52,250 1.025% 1,163,749 5.010% 3.542% 3.415% 5.68 8.21
Jun 2011 52,131 0.495% 1,165,428 5.012% 3.546% 3.519% 5.83 8.63
May 2011 52,057 1.908% 1,148,017 5.014% 3.760% 3.540% 5.86 8.75
Apr 2011 51,865 1.741% 1,131,062 5.016% 3.954% 3.747% 6.29 9.83
Mar 2011 51,883 -0.282% 1,134,862 5.014% 3.888% 3.951% 6.79 10.98
Feb 2011 51,895 1.577% 1,117,581 5.012% 4.040% 3.877% 6.66 10.60
Jan 2011 52,562 -0.899% 1,145,690 5.014% 3.901% 4.031% 7.01 11.38
Dec 2010 52,457 -1.907% 1,171,073 5.012% 3.581% 3.903% 6.72 10.65
Nov 2010 52,059 -2.103% 1,194,024 5.014% 3.189% 3.566% 5.91 8.72
Oct 2010 51,614 -0.278% 1,191,130 5.020% 3.096% 3.180% 5.23 7.01
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