On the page Production level you can read
"This service equals to 0.1% of cumulative cost of the fleet in metal and minerals. These resources will be taken gradually from all colonies in proportion to their production level. This amount cannot exceed the total output.
Fleet value is calculated when daily statistic updates, and it includes all fleet units: in flight, on the planets, asteroids, etc. Amortization is not assigned up to 25000 points."
And now you are already have 25K