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According to the label, it's year on year. The slider should have two control points so you can view any interval.

Are you sure? The homepage says "Scroll, zoom and click on individual stations to see how passenger numbers have changed since 1997". I think it's for the whole period.

Many stations are white at the end, but have no reason for the increase to have been in the final year. Picking one I used to travel through [1], it's white on the map, last year's increase was <10%, but the increase since 1997 is huge.

(Also, this is Great Britain, since Northern Ireland isn't included.)

[1] https://en.wikipedia.org/wiki/Barnes_Bridge_railway_station

Yeah I noticed that too. The glowing red embers turn white hot with increase ...mostly towards the end. Because we're comparing with 1997 levels. I suppose that shows the general trend well, but it's not so good for actually spotting patterns of change as the time slider moves.

It's surely for the whole period. Even the fastest-growing stations could not sustain 500% growth, year after year!

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