If “leaving religious life” includes the departure of postulants and novices who did not persist until full profession, that’s what is to be expected. People enter a religious foundation, initially, to “test their vocation.”
Not every seminarian becomes a priest, and not everyone who essays religious life is going to stick with it.
Excellent point. I was a seminarian (Carmelite). Was in my first year of simple vows, and discerned that it wasn’t my vocation. I wonder if I would have wound up in this metric?