"That's why I am not keen on using the number of congregations as a measure of growth or stagnation in jw organization. Worldwide - and even nationally - numbers that comprise congregations vary enormously."
I had thought similarly.
However, I added the congo numbers to the Western country spreadsheet, and they have generally dipped proportionately to the publisher dip (Canada and Britain increased - probably foreign language)
( 87 fewer total congos in the Western countries listed - 32499 in 2016, 32586 in 2015 )