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There are definitely some data missing, because in Czechia where I live there are some areas on the map with 100% decline in population like Libavá and Březina, which definitely have some population. I don't know about any village that would be totally de-populated. https://obyvateleceska.cz/olomouc/libava/503941

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It's a bit weird and maybe more complicated.

I checked the area around Munich, Germany (where I live).

- one is an actual lake (correct shape) that went down to 0 from a bogus 1

- three are actual forests/parks which may have had some sorts, but 11/16/48 to 0 is a rounding error, but there is no filter for absolute, it technically is -100%...

- bit further out is another lake with 14 to 0

Classic null being replaced by 0.

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