Neasa Hourigan (Dublin Central, Green Party) | Oireachtas source

I have a question about data which struck me when talking about the prisons. I was reading something about it. Do we have the data about how many persons are eligible for OST or who would be appropriate for OST? Not somebody who has tried a drug once, but somebody who would benefit from OST. How many are actually in treatment? One statistic I read stated 35% of people who should be in OST or that kind of therapy were actually taking it up.