The US has the highest documented incarceration rate in the world. It breaks down to about 754 per 100,000 (2009 figures). By way of comparison Canada had 117 per 100,000 (as of 2008), Australia 133 per 100,000 (as of 2010) and Japan 59 per 100,000.
According to 2010 figures put out by the US . . . → Read More: drive-by planet: Supermax hellholes: solitary confinement in US prisons