Is it harder to build a naval fleet today than two-three centuries ago?
Do we spend more or less % of GDP to build the complete fleet from scratch? Do we spend more or less % of GDP per ship, or per given class (battleship, frigate etc)?
Does it take more time to build a complete fleet? Does it take more time to build ships of a given class? Does it take more time to build the biggest naval vessel on the planet?
I don't expect the numbers to be too exact, but may be there is some well understood trend known. I do understand this is all kind of vague, but I hope for some interesting surprises, like, for example
Great Britain keeps building approximately constant N destroyers per year since 1820 or
The time and price (% of GDP) to build the largest available vessel on the planet doubles every N years
The number of Frigates in the world stays constant for the last 300 years.