The nonprofit Prison Policy Initiative on Tuesday released its annual report on the state of mass incarceration in the U.S., which offers some essential context about the sheer scale of the issue and the difficulty to address it.

The numbers havent changed much since last year . There are still about 2.3 million people locked up around the country on any given day, according to the reports analysis of the latest available data, much of it from 2015. Populations at state and federal prisons, as well as in local jails, have fallen slightly. But America remains the leading jailer on the planet with nearly 25 percent of the worlds prisoners, even though the U.S. represents just 5 percent of its population.

As in years past, the report includes a graphic that details the intricate network of correctional facilities that house people who are serving time or are otherwise detained for a variety of crimes or charges. The authors say the data underscore a harsh reality: There is neither a simple nor a singular solution to the problem of mass incarceration.