From the Wall Street Journal:

The Federal Reserve‘s net income surged 53% to $81.74 billion last year from 2009 mainly due to higher earnings from securities the central bank bought to counter the financial crisis, according to final audited results released Tuesday.

Almost all of that income — $79.27 billion — will be sent back to the U.S. Treasury. The record transfer marks a 68% increase from the $47.43 billion the Fed sent back to Treasury in 2009. The figures were slightly higher than preliminary results published in January.

To fight the financial crisis, the Fed bought securities whose value had collapsed due to fear and uncertainty in markets and set up emergency lending programs for banks and firms, thus boosting its balance sheet. The central bank came under attack for taking too many risk with taxpayers money and putting itself in a position to suffer losses.