In 2006 there were an estimated 9.3 million people in prison worldwide at any one time. Half of them were held in just 3 territories: the United States 24%, China 17% and the Russian Federation 9%. Worldwide 0.15% of the population are in prison, that is one person in every 670.
The highest percentages of population that are imprisoned are in the United States, at 0.75%, and the Russian Federation, at 0.60%. The lowest rates of imprisonment are in Burkina Faso and Nauru. In both territories only 0.02% of the population is imprisoned.
The rate at which people are imprisoned varies widely and reflects different customs.