What time period does this cover? "Russian Federation"

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I would use a better alternating color scheme, so it's easier to tell neighbors apart, or put the names on the other side of 'the x-axis', next to their respective peaks, so that way your eyes don't have to skip from right to left when reading the whole image, including the text

Barely legible names and tough to really compare. There’s probably just too much here to be able to show we’ll in a jpeg.

Very cool idea, but no dates and the angle and colour scheme makes it hard to see anything.

What’s wrong with a line graph

It looks as if Canada has about 1/5th the population of China. It seems this is a logarithmic scale, which does not make sense.

simple 2d would have been much easier to understand than 3d...portions of the graph are occluded (e.g. Italy).