About statistic

Hello to all dear Postcrossers,
I really like statistics and I was wondering if it was possible to have a ranking of the number of Postcrossers / cards sent / received by city, or region. I would be very curious to know which would be the first city… Moscow? Berlin? Chicago?
Also, we know that there are officially more than 800000 postcrossers but would it be possible to know how many of them are really active, I mean those who send at least one card per month? It’s just by curiosity…
Thanks dear friends! (and if you feel like it, could you tell me what you think about this suggestion Thank those who presented us with Postcrossing - Postcrossing / Suggestions - Postcrossing Community? :blush:)
I wish you all a happy day!