Dont just look at the number, look at the size of the market.
PS4 accounts for over 1/3 of all hardware sales in the UK since 2014.
PS4 accounts for about 1/2 of all hardware sales in Germany since 2014.
PS4 accounts for under 1/4 of all hardware sales in Japan since 2014.
PS4 may have sold more in Japan than any individual European country but it represents a much smaller percentage of the overall market.
It doesn't mean the market is irrelevant like some are trying to claim, the main bulk of Japanese developed games don't do that well outside of the country especially in Europe, that 1/4 in Japan still pulls in far more for them than the rest of the world combined. This is why many games right now are being announced as PS4 and Switch with no X1 version, some people are trying to push a notion that Sony would be alright with out Japan when all that would do is surrender almost all third party support in the country to a competing platform.