The rate has fallen every day since the ECB allotted a record 489 billion euros ($657 billion) of three-year loans to 523 banks on Dec. 21 to keep credit flowing amid the region’s sovereign debt crisis. The central bank plans to hold a second longer-term refinancing operation for such loans tomorrow, with full allocation a day later. Financial institutions may ask to borrow 470 billion euros from the ECB, the median of 28 estimates in a Bloomberg survey showed.