There's some data here but isn't even close to 1/3: The article talks about user "koavf", who is #2 by number of edits https://en.wikipedia.org/wiki/Wikipedia

There's some data here but isn't even close to 1/3: The article talks about user "koavf", who is #2 by number of edits https://en.wikipedia.org/wiki/Wikipedia:List_of_Wikipedians_by_number_of_edits#List_of_Wikipedians_by_number_of_edits https://en.wikipedia.org/wiki/Wikipedia:List_of_Wikipedians_...