The numbers are kept up and the increase is artificial.
Remember when they started to allow the elderly and sick report 15 minutes. This gave a sudden boost in the following year.
Then they allowed not one parent, but both parents to report 4 hours each month, regardless of whether kids were getting individual study, as taking them to meetings and out in service counts too. Parents have no reason to be irregular or inactive anymore and the numbers went up.
Further a lot of buzz was created when the auxiliary pioneer hours dropped to 30 hours.
And of course the easiest hours can be racked up sitting quietly beside a cart.
Finally as said, elders fill in often by default one hour for those who don't hand in their reports to prevent the CO hassling them.
The 8 million is simply not true.