The source is listed as The Angus Maddison Project & World Bank, so I have my doubts, particularly in that several regions on the list were together part of a single entity at various points on the chart, particularly all of the Soviet Union, Austria-Hungary, the Ottoman Empire and so on. Historical regional borders are NOT part of the data and for that reason, I wouldn't put much stock in the numbers.
I've looked at GDP numbers for decades, however, and they do fit in the ballpark of figures I recall, so the chart is a fair estimate for what's gone on, particularly in the last twenty years. I've no doubt the figures are much more accurate for the dates after 1999. The chart continues well past 2019, however, and such projections almost always wind up being garbage ~ but again, what the hell, its fun.
The channel WawamuStats, plus another called Ranking the World, has a pile of these videos. I've been watching them with the annoying sound turned off and the speed reduced to 0.25, so that there's time to think about what's happening in a given year.
Worth a look.
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