Getting number of subscribers to a service?

[Christopher Guess]

I know it's possible to get the number of subscriptions a user has, but is it possible to get the number of subscribers to a single service?

I'd like to be able to run stats on the APNS and GCM services I have up. I'm keeping track of it in a seperate database, but I need to make sure the numbers are kosher.

Thanks! This is a great product.