Unofficial, back of a fag packet, in the pub, my mates friend knows etc...
50% bin at CV (Probably standard, spelling, corrections, inconsistencies, addition problems, badly answered questions, non applicable licences etc.)
50% to '2 out of 3' through day1.
2 out of 3 remainders through Sim to swim.
Obviously those are rough and ready, take with a pinch of salt, non official numbers!!!!
Add to that that some days see more 'suitable' applicant than others which skews the figures on the day.
Yew 'aint see mee! Roight!