My older, US diocese has closed about 45 percent of its parishes in past 25 years. But it is hard to “count” or compare. Often two parishes are open, but they share a pastor, and perhaps other staff. Or two parishes are merged but retain some identity as worship sites.
Unfortunately as the priest shortage took hold, the diocese pulled priests out of everything else in a desperate effort to postpone closings. As a result, the great majority of priests spend the great majority of their time with seniors. Youth or young adults, especially in the outer suburbs, grow up without ever meeting a priest, except a hand shake at Confirmation.