I estimated the supply using the historical data from https://coinmarketcap.com/currencies/steem-dollars/historical-data/ dividing the marketcap by the closing price.
13% is probably closer to reality than 12% (I did the math in my head so I was probably off by some decimals).
No worries. There has been about a 10% bounce in the STEEM price since I wrote this and that might be enough to keep the wolves from the door if we've found a bottom.
I still find steemworld more useful than coinmarketcap.com because it shows the current supply of both STEEM and SBD in real time and it shows the various feed and external prices too. I did have the debt level near 13% but on this rally its now lower so I have par at about 85 cents for the SBD. This is now slightly higher than market price so we're closer to equilibrium here.....