Out of about a dozen, we lost one or two at Basic. Including a self-suspension. But back then everyone received basic training, not just the pointy-heads.
On the Gnat we lost 3 out of about 9. No-one was killed on our course, but most people had an emergency at some stage.
At TWU we lost a couple who asked to fly helicopters....they never did. Another guy stoofed in. The rest of us got through, but several were on review at times.
Bucc OCU was appalling. 2 out of 3 pilots chopped, 1 out of 3 navs. The surviving pilot was a re-tread from Canberra B(I)8s and was also a QFI; of the navs only one was brand new from training. At the time no crew with both a pilot and nav straight from training had passed the course for the previous 2 years.....
Later, the Vulcan OCU was a much happier organisation and everyone breezed it. But on the course ahead of us, a pilot was chopped because he couldn't handle being out over the ocean miles form land with only the crew to help. He could fly the jet OK - but bottled the solo to 15W and back.