The Federal Reserve sent about $77.7 billion in profits to the Treasury Department in 2013, the result of gains reaped from its unconventional efforts to spur economic growth.

In 2012, the Fed sent a record $88.4 billion to Treasury coffers.

The Fed’s portfolio of securities and other assets has swelled to more than $4 trillion since the financial crisis, growth driven largely by several rounds of bond purchases aimed at lowering long-term borrowing costs to spur more spending, investment and hiring.