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The Bloomberg US Treasury Index (formerly Bloomberg Barclays US Treasury Index) has history going back to 1973. This is the most widely used US Treasury benchmark. For even longer histories, Ibbotson's 5-year and 20-year government bond indices ("Ibbotson SBBI") have monthly histories since 1926. These are now available for free to CFA members.


FRED economic data is a good source for historical data. See for 3 month Treasury rates and for Baa corporate yields (since 1981). 10 Year Treasury rates have data from 1962 at Data is available in daily, monthly, quarterly, and yearly ...


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