That's inflation in US prices. It may not be transferrable to another country, where various things cost more/less, and rise/fall differently through the years.

When my parents went to Japan in the eighties they were shocked that coffee in Tokyo was 4 times as expensive as in Germany. When I visited in 2016 I was similarly shocked that a vending machine Coca Cola costs half of what it costs in Germany. Japan's deflation has led the country to be very affordable.

That chart is a crude snapshot of the Nikkei 225 from 1990 to 2009. Since then it's rebounded by quite a bit although it's still quite a bit under its Dec 1989 peak. But of course a stock market index isn't the full economy, so I would disagree that this chart by itself constitutes proof that Japan is stagnating.

Chart source: https://mebfaber.com/2009/12/20/japan-the-us-and-the-lost-de...