For DM-2 and DM-3, it's up to 13% at-risk pay, with a potential 7% bonus, and for DM-4--there are only two of those, the Clerk of the Privy Council and the Deputy Minister of Finance--it's up to 17% with a potential of 8% bonus for surpassing the objectives.
On November 7th, 2006. See this statement in context.