I doubt anyone would know actual figures or percentages off hand.. you'd have to see your university's grad destination surveys.
In my experience the market's been quite good for a number of years where if yuo have all your exemptions and have relatively good communication skills you would expect to land an actuarial position. However we're in a downturn atm and obviously firms will hire less but I suspect the actuarial industry has been more resilient than most others (eg IB).
A lot of ppl come through the course not being interested in actuarial studies at all.. particularly the good students.. they probably go into things like investment banking, trading, funds mgt .. on the other hand, weaker students who cant get a job in actuarial might go into risk management, finance or like a govt type job (ABS, Treasury, APRA etc)
bear in mind thats just my experience and i have found that in the end, everyone gets employed somewhere.