virtual_supply
273,124,527.937 STEEM
current_supply
266,733,490.654 STEEM
current_sbd_supply
11,491,085.036 SBD
total_vesting_fund_steem
189,925,678.587 STEEM
pending_rewarded_vesting_steem
183,726.590 STEEM
In other words the rewards come from the vested steem that then generates a % of inflation and you get a rewards pool, that the people with the "vests" then distribute as they see fit ....
in short :)