I'm reading a book on monasticism (The World of Medieval Monasticism, by Melville) and the author very often makes statements like "by year X, there were Y monasteries in Europe with around Z members" (sometimes offering sources). I was prompted to search online for historical statistics on monasteries (by order, gender, country, etc). From the book I'm reading as well as online searches, the information (at least to a general degree) seem to be around (e.g. a paper with statistics about women communities for the period 500-1100 AD is here). However, these sources seem to be partial. I was not able to find a resource collating in a systematic way all the information.
Are you aware of any such resource (reference book, database)?