I’d assume this is just in America. Worldwide, both Islam and Christianity are growing exponentially. This is in countries with birth rates above replacement level, and religious people have more children. Just look at the ultra-orthodox in Israel.
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.
St. Paul wrote in Corinthians that not all have received the gift of Celibacy. In a global talent pool, 3000 people who determine it’s not for them is probably not out of the ordinary.
over 3,000 religious leave consecrated life each year
While there are times that I almost yearn to join the religious life, I realize that it must be very challenging. It cannot be an easy life, and I can imagine that only a small percentage of people are capable of accepting its rigours.