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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%.

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STEEM 0.06
TRX 0.32
JST 0.064
BTC 69236.07
ETH 2133.11
USDT 1.00
SBD 0.48