For an Agent's position, a 4 year college graduate. See: www.fbi.gov
In order to be a FBI you will need to attend a American Collage/ University but most likely collage.
Need to hold a bachelors degree.
A really good one
1 year
Less than four year's
The job outlook for an FBI agent varies depending on what exactly they are working in. If they are out in the field a lot, their outlook could be grim. Many FBI agents die in duty every year.
Collage started in the year 1881.
Check the FBI Uniform Crime Report
The FBI publishes Uniform Crime Reports that will help you.
Typically, it is the minimum of a bachelor's degree which is a four year program of study.
You will have to go the CDC and FBI and compile the data from their reports.