What I'm saying is that I'm not sure we measure it as well as we should; therefore, maybe we are not quite educated in determining how successful we are in doing it.
The job is to correct people; 100% of the people who leave should be corrected. That is nirvana; we should struggle and strive to get there. We shouldn't stop until we get as close as we can to that. But you had better know how to measure before you start setting your objectives.