Det finns mindre sju tusen trollkarlar i England under tjugonde århundradet. Om tre tusen under händelserna i serien.
Mindre än en av varje tusen guider är en animagus
It is immensely difficult to change oneself into an Animagus and the process, which is complex and time-consuming, can go dramatically wrong. As a result, it is believed that fewer than one in a thousand witches or wizards are Animagi.
Pottermore - Animagi (behind paywall)
och det finns mindre än sju Animagi i det tjugonde århundradet
“Because . . . because people would know if Peter Pettigrew had been an Animagus. We did Animagi in class with Professor McGonagall. And I looked them up when I did my homework — the Ministry of Magic keeps tabs on witches and wizards who can become animals; there’s a register showing what animal they become, and their markings and things . . . and I went and looked Professor McGonagall up on the register, and there have been only seven Animagi this century, and Pettigrew’s name wasn’t on the list —”
Harry Potter and the Prisoner of Azkaban - Chapter 18
(Ja, det fanns några oregistrerade, men båda dessa statistik hänvisar till känd animagi.)
Detta sätter gränsen vid sju tusen trollkarlar i England under tjugonde århundradet.
Antalet guider som lever under de sju år som böckerna är inställda skulle vara betydligt lägre, i överensstämmelse med Rowlings uppskattning av 3.000.
Let's say three thousand [wizards living in Britain], actually, thinking about it, and then think of all the magical creatures, some of which appear human. So then you've got things like hags, trolls, ogres and so on, so that's really bumping up your numbers. And then you've got the world of sad people like Filch and Figg who are kind of part of the world but are hangers on. That's going to bump you up a bit as well, so it's a more sizable, total magical community that needs hiding, concealing, but don't hold me to these figures, because that's not how I think.