George H. W. Bush, Barack Obama, George W. Bush, Bill Clinton and Jimmy Carter.
The United States spent nearly $4 million on the the pensions, travel, office space, staff of former presidents.
NPR's Cheryl Corley sent in this report for our Newscast unit:
"Taxpayers paid out nearly $3.7 million dollars for former presidents last year.
"That's about $200,000 less than in 2011. The Former President's Act of 1958 set up the funding for ex-presidents.
"Departing presidents also get extra help in the first years after they leave office. So the most costly ex-president in 2012 was George W. Bush, who received just over $1.3 million.
"Bill Clinton spent just under a million, George H.W. Bush nearly $850,000 and Jimmy Carter spent about a half-million dollars. A bill to put more limits on the costs taxpayers pick up for ex-presidents died in committee last year."
The AP reports that this information comes from a report by the Congressional Research Service.
The Former President's Act gives ex-presidents $150,000 a year. It also gives them $96,000 a year to hire a staff person.
The Act also provides the widow of any president with a $20,000 a year allowance.
There are currently four living former presidents.