Carter still holds the record- 21.98:
“Jimmy Carter may have won his first election in part by campaigning on the “misery index”. But when he assumed the Presidency he enacted policies that had disastrous economic effects on our nation. When he left office, America was in far worse shape. The “misery index” reached an all-time high of 21.98 % and Ronald Reagan was swept into office in the wake of widespread voter revulsion towards Jimmy Carter.”