Just to bump this question: StackExchange Inc. turned off the periodic network-wide data dump earlier this year, and it can apparently only be resumed with permission from very high in the company. I guess this includes MO. I haven't heard otherwise.
So we are probably missing some of our more recent data.
Edit: now reinstated https://meta.stackexchange.com/a/390200/226541 after a lot of push-back.