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It will depend on the way Steem Power is spread amongst all accounts. Maybe it could be quite stable for a longer period of time.

As far as I can see it will be difficult to calculate. But maybe somebody knows how it could be done.

I think it was sayd that the total amount of Steem produced will double every year. It seem to be enough to guarantee the same stable interest rate. But I wonder if that could be changed any time or it's fixed in blockchain.

That is correct 100℅ every year. or double the amount.

As far as I know the ratio 10-90℅ could be changed. Just like the total amount of distribution of Steem per round. It would be changed through a fork.

Just like the payout method was tuned recently to keep the Steem Back Dollar price stable.

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