Interesting - from this data it does appear that US is on the lower end of the spectrum. I will say that this dataset is very hard to parse - a lot of information and very little is apples to apples in a simple ranked chart. Also some countries (Denmark for instance) have fluctuated wildly in a span of ~10 years, which suggests that what is treated as a crime might be a driving variable here. I would be really curious to see a more detailed analysis of this data that segments the population by offender class (if you lump in non-violent and violent offenders I would imagine that you are making more of a commentary of the relative enforcement of these respective crimes).