The intention is to have and actual figure of who left and why
Did you ever think their reasons are theirs? They might not state the reason, nor care for having their reasons published. The priest retains a right to privacy if leaving the priesthood - perhaps more than ever at that point in time, since they cease functions as public persona. Such reasons are also to be addressed internally foremost, and thus the figure doesn’t entirely pertain to public discussion.
since this deed is not done for some reason
Probably for several reasons, and probably for good reasons. However, the figure isn’t “hidden” it’s simply not specifically compiled. (In smaller countries the figure is public knowledge, for the simple reason there are few priests and every priest is a high profile public figure. Not only that, but every priest leaving the priesthood is guaranteed to get media coverage - something the priests themselves (their families, and the faithful) at that point of their life don’t appreciate, since those leaving the priesthood want privacy during the transition - every detractor in the country having a field day of their fellow man’s life.)
we can never fully address many of the reasons my fellow priests left
The reason is probably simple: the priest wanted to leave.
And, I assume, their wish is legitimate, thought through, pondered, matured, advised both by peers and superiors. The laity could hardly advise a priest regarding the priesthood. I just don’t see how that figure pertains to the public arena - for the simple fact discussion of the matter in the public arena is indecorous of its personal nature (inevitably tending to objectivation of individuals.)
-On a side note: some time ago I read a few documents a couple of decades old, where parishioners in a small dioceses objectified themselves and their parishes - in a self-study and self-reflection effort. To some extent, I consider those documents and efforts partially fruitless since, during subsequent years, I failed to see any reversal in the trend of falling church attendance. (The origins of the problem laid elsewhere, in the generational gap that didn’t allow for a efficacious transmission of the faith from elders to youngsters, due to the fast pace of society’s changes. - I sometimes think any contemporary parish catechist would need a degree in religious sciences and apologetic.)
And I have to suppose: priests know best. Doesn’t the priesthood in its internal forums openly debate their own issues?
we can never fully address many of the reasons
I’m sure its been amply addressed -and is a matter of open reflection and debate- in specialized literature.
God bless.