My wife is a US Naval Academy Information Officer (aka Blue and Gold Officer) - and these are the statistics:
The numbers vary from year to year, but on average, about 15 members of a USNA graduating class are selected for Navy SEALs and go directly to BUDS. About another dozen will do other special ops (including EOD).
We have one friend whose son (also USNA graduate) initially selected SWO and transferred into SEALs from the Fleet.
thank you