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Easy and Quick Solution. Tip: Use the configuration window for input tool as well.
Answer assumes previous years (not in the data) are treated as null (I agree). However, if there's a null value that a country has for a given year, it's treated as 0 (at least that's what I'm currently understanding). Need some consistency here.
Again, more assumptions in Q3, it appears all NA values have been replaced with 0. Not sure why, if it's NA, it's NA & there's also rounding occurring pre aggregation.
Not a fan of this challenge.
Spoiler
Time Taken: 50:30 (assumptions dragged this out)
