"Federal arrests decreased from 188,164 in fiscal year 2013 to 165,265 in fiscal year 2014. Arrests by federal law enforcement more than doubled between 1994 (80,450) and 2013, and then declined by 12% from 2013 to 2014 (figure 1). [...] This report describes defendants processed at each stage of the federal justice system: arrest, investigation and prosecution, pretrial detention, adjudication and sentencing, corrections, and supervision in the community. Data are from the Federal Justice Statistics Program (FJSP). The FJSP collects, standardizes, and reports on administrative data received from six federal justice agencies: the U.S. Marshals Service (USMS), Drug Enforcement Administration (DEA), Administrative Office of the U.S. Courts (AOUSC), Executive Office for U.S. Attorneys, the BOP, and the U.S. Sentencing Commission."
Bureau of Justice Statistics: http://www.bjs.gov/