I think that this section in our statistics - is the most vague. Because it is very difficult to understand the present the number of real and unique users. Here it must be remembered that some users have opened 2 or more accounts by connecting them not their names , but the names of their relatives. But behind the scenes is the same person. There are various violations. Some users do not hide your second account, but how to make such calculations? It's too hard, I think. Overall , of course it's nice to see such a surge after 2017-07. It is interesting to look at the activity of new users. Thank you @eroche for this information and I wish You success in further studies.