Average open rate per list

Just reiterating the increasing unreliability of open rates: https://forum.mailwizz.com/threads/how-to-keep-lists-clean.7908/post-48859
Just a couple of many sources:
 
@nadworks I agree with you they are unreliable, Gmail, mimecast and others are scanning the links, so open and click rates are affected.
The lambda client is however still attached to these indicators. Even taken with a pinch of salt...
 
Average of all campaigns sent to that list open rate.

Code:
(Σ open% for the list)/count of campaigns sent to  list

it was a request from a client: What's the average open rate for the master list? Had to do it manually :)
I've added it for future :)
 
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