
U.S. District Court
Western District of Missouri
For current information, view Treasury Constant Maturities - 1-year, Weekly (Friday) for the correct rate.
For historic data , select Historic Data, then go to Treasury Constant Maturities - 1-year - Weekly (Friday).
This information provides historic rates back to January 1, 1962.
http://www.federalreserve.gov/releases/H15/Current/