I'll have to check the posted accounts report because I don't even remember what the tithing err voluntary congregation donation was each month.
As many said at the time this was implemented, people tend to be overly optimistic about their ability to contribute on those anonymous surveys and as a result, there was an unrealistic amount promised. And the WTS likely knew this was going to be the case. Certainly seems to open the way for a tithing arrangement so they can track the slackers.
I thought about putting down $100 per month on a slip but I've shared in so much deception as a JW that I simply can't be bothered anymore. So we didn't turn a slip in.