Incarceration in the United States is a primary form of punishment and rehabilitation for the commission of felony and other offenses. The United States has the largest prison population in the world, and the highest per-capita incarceration rate. One out of every 5 people imprisoned across the world is incarcerated in the United States. In 2018 in the US, there were 698 people incarcerated per 100,000; this includes the incarceration rate for adults or people tried as adults. Prison, parole, and probation operations generate an $81 billion annual cost to U.S. taxpayers, with an additional $63 billion for policing (criminal law only). Court costs, bail bond fees, and prison phone fees generate another $38 billion in individual costs.