Those are two different things. The counselling service—and those statistics are some years out of date, but they're the most recent we had.
The debriefing is a different process. That is simply a discussion, in open court usually, between the judge and/or someone else. Mostly in the Australian context, it has been judges who have implemented that system of their own volition to provide jurors with closure. That would not necessarily involve a counsellor.