That's interesting - it sounds much bigger than this mention in an anthropology textbook from 2014, I wonder if it has grown so much or one of the counts was far off? <a href="https://books.google.fr/books?id=mcaiAgAAQBAJ&pg=PA270&lpg=PA270" rel="nofollow">https://books.google.fr/books?id=mcaiAgAAQBAJ&pg=PA270&lpg=P...</a>