In the week ended May 11, the weekly average yield to maturity of the Bond Buyer Municipal Bond Index fell one basis point to 4.21% from 4.22% the previous week. The BB40 Index is based on the price of 40 long-term bonds.

The Bond Buyer's 20-Bond GO Index of 20-year general obligation yields was one basis point lower to 3.81% from 3.82% in the prior week. It is at its lowest level since April 20 when it was at 3.71%.

The 11-Bond GO Index of higher-grade 20-year GO yields decreased by one basis point to 3.32% from 3.33% in the previous week. It is at its lowest level since four weeks ago, when it was at 3.22%.

The Bond Buyer's Revenue Bond Index dropped two basis points to 4.01% from 4.03% last week. It is at its lowest level since April 20, when it was at 3.91%.

The yield on the U.S. Treasury's 10-year note was four basis points higher to 2.40% from 2.36%, while the yield on the Treasury's 30-year bond increased three basis points to 3.03% from 3.00% in the prior week.

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