Based upon a website I viewed, in which the author states they got their information from the 'US News and World report'*:
≈390 are interviewed, ≈360 are accepted, ≈210 matriculate.
However, take it with a grain of salt, because
*edition (year) not specified.
I think this speaks volumes about WVSOM, however. They do not appear to over-interview people (which is good; if they're not truly interested in you, they will save you the $500+ in travel costs), and people seem to like the school so much that they actually choose to attend once they are accepted.
Edit: these numbers arise from ≈5,000 received applications (based upon the CIB).