If you are just wondering how many applicant just to know that is one thing, but low number of applicants doesn't necessarily increase a person's chances. The board doesn't have to use all of the spots it is allocated to use at a board, you also wouldn't know how well the applicants did on the ASTB, it could be a small board but the recruiters may have only encouraged those to submit with 8's and 9's, or many could have legal waiver, or not.
The only thing an at-board list will tell you is that if you are on the list then your application should be reviewed by the board, but that is no guarantee.