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I have seen scripts already written tracking that flow of SP to Steem and back.
This index is not the same and is a kind of slower moving indicator - even the day to day changes must be considered only when you keep the general trend in mind.

to continue my thoughts on SP to Steem movements... I strongly believe everyone should be in power down mode. 104 weeks is a very long time anyway. When the steem comes out of vesting each week if nothing has changes you simply power it back up, if your position on Steem has changed you sell (or hold it liquid for days or weeks). Just the reasonable thing to do and you do not loose so much from divesting and vesting back up in several hours or so.