The problem with stats of reoffending is that they often don't make a seperation between reoffending with another sex crime, or just going back to jail for some other crime or probation violation.
I do remember though that the re-offending rate for men who rape more then one victim was really high. Some stuff to think about because we have to manage our justice system better then having people on the street with no legal place to live. You can't just keep building parks next to apt buildings they live in for the sole purpose of moving them on. IMO that is not a solution.
IMO we should find a way for people to get off the sex offender registry if they don't reoffend. Once a person has 2 sex crimes then ok leave them on forever. Better yet just keep them in prison.