Is it true that so many priests left the priesthood after Vatican II?

I once heard that so many priests, monks and nuns left their vocations and returned to lay state immediately after Vatican council II ended. Is this true? I also heard that so many convents and monasteries shutdown. I know now that churches across Europe continue to shutdown and Christianity dwindle. But is there any official trustworthy statistics or records for all this? Is there a good reference that talks about these issues? **Update 1:** I found the following SSPX research paper Fruits of Vatican II : But I need more guidance in evaluating it (how valuable it is and what other research exists in this are, especially books treating this matter). **Update 2:** Another resource I found is a blog article by the same title by Patrick Hawkins, a [contributor to One Peter 5](https://onepeterfive.com/author/pfhawkins/) (a website for restoring Catholic Tradition). But again, I am looking for a trustworthy interpretation of this data in the form of a book. **Update 3:** Another is a book list on Second Vatican Council by [Dr. Peter and Julian Kwasniewski](https://bookshop.org/shop/tradition-sanity-list).