The weekly average yield to maturity of the Bond Buyer Municipal Bond Index, which is based on 40 long-term bond prices, increased four basis points this week, to 5.15% for the week ending Aug. 15, 2013. This is the highest weekly average for the yield to maturity since the week ended July 28, 2011 (107 weeks ago), when it was 5.24%.

The 20-Bond GO Index of 20-year general obligation yields increased seven basis points this week, to 4.80%. This is the highest level for the index since April 28, 2011 (120 weeks ago), when it was 4.86%.

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