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Comments

Colin Fredericks

I don't think it's that immigration is monotonically increasing in this chart; I think it's that total immigrated population is always increasing. It's like the rings on a tree trunk. Since it's only measuring influx (additions) and not net flux (additions - subtractions), it doesn't need a way to show negative values.

Comparing current and past levels is real difficult, though. I think the ring at 2000 is larger than one of the rings at 1900, but I'm not certain.

Kaiser

CF: I agree that the chart shows only influx and therefore the data series is monotonically increasing, and so there isn't any problem with how the tree-ring design is used here.
Any comparison is challenging here: the same number of immigrants in two consecutive years will show up as two rings of different widths.

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