A thread I posted to recently got me thinking about this q.
There is no even remotely exact answer so don't try to answer...it's a massively moving target and even harder to define (government/secret service data, offline storage,etc would be almost impossible to ascertain ), but this short article might give an order of magnitude idea...
www.sciencefocus.com
There is no even remotely exact answer so don't try to answer...it's a massively moving target and even harder to define (government/secret service data, offline storage,etc would be almost impossible to ascertain ), but this short article might give an order of magnitude idea...