Whole process.
Interesting.
It was 30% in Portage alone when I went through, and 50% on the 01 courses each year. Substitution of civ instructors, who wanted the job, in place of pipeliners on the least-desired flying posting in the entire CF probably dropped that a lot. The first (trial) course in 1992 saw a 100% pass rate - but that was only ten students, all of whom were Captains with at least a couple of years in their previous occupations.
I probably owe my Wings more to having had a mature ex-Tracker instructor who was married than any great ability on my part. Had I been stuck with an RMC pipeliner whose dreams of fighter and fair-maiden-conquering glory had been shattered with three-year sentence served on Musketeers and the slim pickings of "eligible"
bachelorettes denizens of the few downtown bars I'd likely have a much different username on this Site, if I ever had reason to join in the first place.
We lost a few more guys in Moose Jaw. I can't remember how many, but a few failed for flying, one for academics, at least one VR, and one medically recoursed. The total there would have been around 15% or a little higher, as a guess.
On the other hand, nobody had failed the Jet Ranger course for twelve years until the one before mine in 1982. That fellow, while between courses, fell off of his dirtbike at a track near Moose Jaw after cresting a hill and had his head run over by two (or possibly more) following bikes; it was said that he was never quite the same afterwards.