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It's too long since I did any programming :/
The data should be ok to extract and present, maybe there already is a steem app doing this?

I don't know any apps currently doing this. https://steem.makerwannabe.com/ is down for some reason. One could have taken their data to make a graph. https://steemworld.org/@haejin could also be crawled for data if you know how to write the App.

Many apps have had trouble connecting to steem lately, might be the reason

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