Notably, there is considerable variation between different regions of the world, according to the World Prison Population List, which provides details on the number of prisoners in 223 prison systems across independent countries and dependent territories.
In Africa, the prison population has gone up by 53%, but that's less than the continent's general population increase of 78%.
A big part of this difference comes from Rwanda, where the prison numbers are still high due to those detained in connection with the 1994 genocide, even though many have been released since 2000.
If we take Rwanda out of the equation, Africa's prison population has risen by 65% since 2000.