Earlier quoted context omitted.
From that article (edit: second article): > The economical miracle can be divided into four stages: the recovery (1946–1954), the high increase (1955–1972), the steady increase (1972–1992), and the low increase (1992–2017). The period of highest growth ended in the 70s, which ended some of the optimism of that period.
If I remember right the steady increase was ended by a huge asset bubble.
https://en.wikipedia.org/wiki/Nikkei_225
(Though, mind you, a price index, not total return, so not including dividends, IIRC)