I am preparing statistics, and I downloaded the csv file a month ago from here:

https://stats.wikimedia.org/v2/#/hu.wikipedia.org/contributing/editors/normal|line|all|editor_type~user|monthly

and I downloaded today again.

I expected, that there will be only one extra line there (Apr 2019), but other values are the same, but I realized that there is significant difference between the editor numbers for the previous months (the new numbers are 5-10% smaller).

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Could you explain this? Did you make a change recently, how you calculate the number of users?