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This chart says absolutely nothing. Completely useless. I know who posted it before you but he has no clue.
You can't track the overall market buy percentage on all exchanges, OTC and future markets combined. I assure you it is impossible. This chart does not cover the whole market. In fact I guess it covers only a tiny fraction.

So you think better not to check this one. Which tool do you suggest to check for this type of trends?

Regards, @gold84