In the past decade, prison and jail incarceration rates fell by more than 10%, according to the Bureau of Justice Statistics.

Why it matters: Following decades of a rapidly growing prison population, the share of the American population in prison is the lowest it has been in more than 20 years. But the U.S. still has the largest incarcerated population in the world.

This comes as many cities and states have enacted various criminal justice reform measures to combat mass incarceration. Even Congress passed a bill that eased certain sentencing guidelines and instituted new rehabilitation programs in federal prisons.

By the numbers: