There's no way to measure that.
We do not know how many people have been arrested for criminal offences--how many people have been charged for either indictable or dual-conviction offences--so there's no way for us to track that. The only thing we can do is manage what is submitted to us.
It's the responsibility of the local police to take fingerprints when it's allowed under the Identification of Criminals Act, and submit them to us. But if they don't do that, we have no idea they're not doing it, or we don't know at what level they're not doing it. We can only do what is submitted to us.