An interesting statistic is reported by TRAC (Transactional Records Access Clearinghouse) (here)-

"In 2004, there were 10,056 individuals who were sent to prison as a result of an FBI investigation and the median or typical sentence — half got more, half got less — was 30 months. In  FY 2008, while the number sent to prison decreased to 9,789, the typical sentence rose to 41 months."

Although this number is not exclusive to white collar crime, it does demonstrate the increased level of incarceration in the United States.

(esp) (w/ disclosure that she is a B.S. graduate of Syracuse U.- home of the Trac Reports).