If you talk to the Coast Guard at the deckplate level, they will candidly tell you that for every boat they get, about 20 slip through.
I haven't heard the curent adminstration ask for more money to increase border security. Have you? Defend them all yu like, but they are failing the citizens of this country by ignoring border security.
That still better than the 1 in 1000 (or much worse) by land.
However, I am not talking about drug smuggling, where the boats can be small, but people smuggling.