Update market and added extrapolation estimate to top 30 HDI countries .md

[TimothyRbz]

This is how I would add the section. I tried to get ChatGPT to integrate the footnotes the way it's done in the other sections, but I couldn't follow the logic, so I decided to clearly separate it and hope it's easier for you to integrate

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Fixes #[issue number] by @[issue author]

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