It's really pretty simple, we're capped at 25DRK per 2.5 minutes, that's 210240*25 per year, so broken down yearly:
Year 1: 5,256,000
Year 2: 2,628,000
Year 3: 1,314,000
etc
So in ten years we'll have maybe 10 million coins in existence. It's a very scarce resource and is designed to gain/keep it's value.
1 834 654 coins were mined in the first 24hrs (17.4% of all the coins that will be mined)http://explorer.darkcoin.io/chain/DarkCoin?hi=4200&count=100And only linux wallet on start, which limited number of miners.
Plus strange block reward bug
https://github.com/evan82/darkcoin/commit/a5737981616b4f6392d4eb63f89760c3afc64e08