Basically yes. Or how about every shul?
A census is obviously the correct way to get the data we'd need (if we wanted to do proper analysis). Either at the shul/family level or narrowed to just the high school/post-high school numbers.
But no such thing will be undertaken, even if there was motivation to do so, because all it would show is the enormously fractured and selective nature of frum society. No true Scotsman taken to the exponential level. Which would underscore one of the major contributing factors of the crisis