Try looking here:
DASA or more specifically for the most recent figures (November) look
HERE, for Army Officer specific figures try looking
HERE although I notice there are a lot of blanks(JPA's fault apparently) and the last set of figures were updated in October.
I had one of the most bizarre days of my service career today, I had some business to do at another military base, after my meeting I went for a wander. Decided I would nip in and see a few old mates who I hadn't seen for a while, I went to visit 4 people and was shocked to discover that every one had submitted notice in the last few months, these are good people 2 seniors and 2 L/H's and then on my way back to work I bumped into a Lt Cdr who I hadn't seen for ages...... guess what, oh and did I mention that my notice has been in for 6 months! People are voting with their feet...fact.