Copyright, 2014, Moody's Investor Services. Reprinted with permission. Moody's tries to include bonds with remaining maturities as close as possible to 30 years. Moody's drops bonds if the remaining life falls below 20 years, if the bond is susceptible to redemption, or if the rating changes.
Release: H.15 Selected Interest Rates
Board of Governors of the Federal Reserve System (US), Moody's Seasoned Aaa Corporate Bond Yield© [DAAA], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/DAAA/, June 3, 2015.