Like Priar, when I asked they also said something similar.
My AFCO said on average there are about 100 successful AIB candidates at the end of each year (before the Sept intake). This year apparently there were 110. Of course 50-60% of these have to be culled for the final 50 in the YO batch.
I didn't ask about application numbers, or about how many POC and AIB candidates there were in total. That would be an interesting figure.