Prison population Convicted adults admitted to prisons Number per 100,000 population Since the 1970s, OECD countries have experienced steady increases in prison population, with the exception of Finland where the rate has continued to decline. Over the last 10 years, Portugal has recorded one of the largest increases together with Spain among European countries. However, levels in both countries remain far below the United States, where the prison population has witnessed a huge jump that bears no historical comparison, with a population in 2000 four times as high as in the early 1970s. Differences across countries have, surprisingly, only little to do with the prevalence and development of crimes but more likely to do with political factors and responses to the increasing belief in certain countries that prison is preferable to other alternatives. When comparing prison populations in 2000, the United States again stands far above the norm with an
