amandm: "I also am trying to work out how many leave every year, even approximate figures would be great,"
WT boasts having + or - 120,000 congregations worldwide. I would venture a guess that up to 5 on average per congregation fade & become seriously inactive annually! That's roughly 600,000 per year. This is the current trend. That number may seem high to some...don't forget that the number of congregation mergers & Kingdom Hall sell-off is also high and risen!
Add in the fact that there are next to zero new outside converts to replace those that are on the fade.
Bottom line...there is a sizable exodus currently taking place among the JW rank and file not to mention the large number of JWs dealing with cognitive dissonance...Yay!👍