This isn't useful unless you can also compare the crime rates in those countries (does high incarceration reduce crime?) as well as the percentage of drug offen

This isn't useful unless you can also compare the crime rates in those countries (does high incarceration reduce crime?) as well as the percentage of drug offenses and the ease of drug import into those countries. I'd also like to see the execution rate for some or these countries. A prisoner is not incarcerated if they're dead.