Which President Has Gotten The Most "Charity" From The Fed?

If you're an observer of the political aspect of the Fed policy, you're likely aware that central bankers like to stay out of the spotlight.  Spotlight creates political pressure, something Fed technocrats publicly dislike.

With this thought in mind, here's a look at the federal funds rate overlaid with politics.

Question - Before going further, which president would you guess has received the most charity from the Federal Reserve?  Meaning, after adjusting for inflation and employment growth (the two factors that theoretically determine the federal funds target interest rate), which president has experienced a very charitable Fed (i.e. keeps interest rates abnormally lower than what the inflation rate and employment growth would predict) and which presidents experienced a...