A better title would be: 26% of violent crime convicts accountable for 63% of violent crime convictions.

In terms of the entire population, probably:

* 96% never convicted

* 3% convicted once

* 1% convicted as many times as the justice system allows until well into middle age (average of five times)

An interesting question is: How many of the 3% are released and take up normal life, and how many are not convicted again because their first offense was severe enough to warrant a long sentence? Edit: Unfortunately, the paper can't answer this question.