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by teambayleaf 2291 days ago
The total return (including dividend payments) of Nikkei 225 between 1989-2019 is around -20%.

I don't know any handy English source for it, but I can tell you that this is the correct number.

Note: It's called "Nikkei 225 total return index" (N225TR). AFAIK the monthly numbers since 1979 are available from Nikkei Inc.