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The chart represents the amount of people who were imprisoned in five nations from 1930 to 1980.

Whereas there were a steady growth in the number of prisoners in America and Great Britain, the quantity of prisoners in other countries fluctuated slightly over the course of 60 years starting in 1930.

The U.S and Great Britain experienced an upward trend in this period. The number of British prisoners rose sharply from 30 to 70 thousand people between 1930 and 1980. In addition, America had the largest amount of convicts, with 130 thousand prisoners in 1980. Especially, America had twice as many prisoners as in Australia in the year 1980.

The number of convicts in five nations was nearly the same in 1970. Canadian prisoners dropped gradually from 120 to 90 between 1930 to 1970. Besides, there was a slightly fluctuation in the amount of prisoners in New Zealand from 70 to 50 over the course of 60 years starting in the year 1930.