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I was under the impression that Steem and Steem Dollars are two different things. I also found this chart for Steem Dollars: https://coinmarketcap.com/currencies/steem-dollars/
Current rate of $0.823666.

Uh, yeah, sorry. Wrong graph.

I think your graph is the right one :) steem and steem dollars are different things, as far as I know :)