the chart illustrates the number of imprisonments in five nations from 1930 to 1980
Overall, it can be seen that the figure for imprisonment of US and Cananda was the two highest throughout the period. The United State changed more steadily and finished at a clear peak in 1980. The Canada decreased despite fluctuate and was the only nation to overtake twice the US, which happend in 1930 and 1950. The figure for New Zealand fell at first and then recovered strongly, while that of Australia showed the most uneven pattern. Great britain increased significantly over the period.
In 1930, the figure for imprisonments of US went up from 100 thousands in 1930 to around 140 in 1940, before falling out to 110 thousands in 1950. After that, this figure enhanced 10 thousands slightly in 1960 and then slipping from 90 thousands, before climbing dramatically at around 135 thousands in 1980. Canada was the second-highest of tall, dipping from 120 thousands to 110 between 1930 and 1940 and then went up slightly at around 117 thousands in next 10 years. After that, Canada decreased sharply from 117 thousands in 1950 to 85 in 1970, before enhancing at around 90 thousands in 1980.
Concerning about other nations. Great Britain reamained unchange at 30 thousands between 1930 and 1940, before increasing significantly and finishing at 85 thousand after 40 years. Besides, Australia fell from 70 thousands in 1930 to 50 in 1950 and then climbing to 70 thousands in 1970, before which was slipped at roughly 50 thousands in 1980. New Zealand went down twice in 1950 , reaching at 50 thousands. After that, this figure rebounded dramatically and ended at 90 thousands in 1980