Crime doesn't pay as much as you might think, say a group of British economists in Significance, the journal of Britain's Royal Statistical Society and the American Statistical Association. The study's authors, from the Universities of Surrey and Suffolk, provide what they call the first "independent econometric analysis" of bank heists, using data from the FBI and British Bankers' Association. Their conclusion? "Statistically speaking, robbing banks is a bad idea. The return on an average bank robbery is, frankly, rubbish. It is not unimaginable wealth." How bad is the pay? Here's a look, by the numbers:

Average haul for U.S. bank robberies in 2010 

Average haul for U.S. bank robberies in 2006 

U.S. bank robberies in 2010 

U.S. bank robberies in 2005

U.S. bank robberies where the thief showed a gun in 2010

U.S. bank robbers killed during heists in 2010

Average number of bank robbers in each heist

Percent of bank robberies carried out by one thief

Amount each additional thief adds to the take in bank raids

Bank robberies in the U.K. in 2007

Average haul for British bank heists (2005-08)

Average per-thief haul from a British bank heist 

Average half-year income for full-time employed Britons

Biggest British bank taking in 2007

Percent of bank robberies that yield nothing 

Percent of British bank robbers who get caught and jailed 

Average number of successful bank heists before a robber is caught

Percent of U.S. bank robberies where the cash was recovered (2010)

Percent of thefts thwarted by fast-rising bank-teller screens

Cost of each of those screens

Percent of British banks that use the screens, with fewer still in the U.S.

Sources: Fiscal Times, Significance [PDF], SmartPlanet, Telegraph, U.S. News