Bluebulb Projects' The Measure of Things presents:
8,700 is about 100 times the number of Submarines in the US Navy.
In other words, it's 120 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 0.0083 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)