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Yeah so check https://steemd.com/

This shows the SBD supply, then you divide the SBD USD value by the Total Steem USD market cap and you get the debt ratio, which is somewhere around 16%.

Coin Marketplace

STEEM 0.05
TRX 0.28
JST 0.046
BTC 64104.00
ETH 1860.02
USDT 1.00
SBD 0.42