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Weekly Challenge
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Not sure this is a good use for a pie chart. It fails to highlight that most countries are below 50%.
Followed the example and used a pie chart, although I agree with @IraWatt and @Jeremy that a pie chart isn't the best choice here. Banning them is a bit strong, but I find pie charts are most useful when you are comparing a small number of values (probably no more than five and that's pushing it).
Spoiler
I looked at the other solutions after I did this and it looks like there aren't a lot of variations. I was debating filtering the World data before doing a join, but the numbers were small enough that it was probably faster to just process all the data than to add the overhead of including another process step. As for using Find Replace instead of Join, with these data sizes and the AMP engine, it really doesn't matter.
My first go at one of these weekly challenges so let me know if I did this whole posting a solution thing correctly. I went with a bar chart:
