Treasury rates: 10-Year Constant Maturity Treasury yield. Short-term government credit: Barclays 1-3 Year Government/Credit index. High-yield bonds, for the 1983–'84 period: Ibbotson Associates High-Yield index; for other periods, Barclays U.S. High Yield index. Long-term Treasury bonds: Barclays U.S. Treasury Long index. Investment-grade bonds and mortgaged-backed securities: Barclays’ indexes. Treasury bills: Citigroup 3-Month Treasury Bill index.
Sources: T. Rowe Price, Barclays, Ibbotson Associates and Citigroup