Ah, OK, I interpreted the "hidden" part referred to finding the report on the website.
If "hidden" means "they are not reporting numbers that they used to report", then yeah, definitely hidden.
I guarantee you they still calculate all those numbers, plus lots more interesting figures that they would never in a million years publish.
For example, I'm virtually certain that the number of American JWs attached to English-language congregations has dropped precipitously over the past 15-20 years. That decline is masked by the increase in JWs attached to American foreign-language congregations - some of that due to "reaching out" JWs switching over, but mostly due to immigration (both JWs moving in from other countries, and the relative success of conversions possible when preaching to recent immigrants).
I am virtually certain - I have no numbers to back it up, because they don't release them, but that is almost certainly the case.