How many students are in the NROTC program at any given time?

I know that there are about 50 detachments, but I don't know how many students are in the detachments. Actually, I'm more curious how many seniors are to be commissioned from NROTC any given year because I know that only 25 officer billets are awarded for the Navy SEAL's each year from NROTC and another 25 from the academy. I know that those 50 spots are very competitive. I am just wondering how many students I am potentially up against.