Japan is the second best selling country for the ps4

[26fm65]

Base from population 2016 UK population. UK just need to have 4.06M equivalent to 20M for USA.  And they have 4.3M 

Japan 5.4 < 7.86  , Germany 4.7 < 5.12  ,UK 4.3 > 4.06  ,France 3.7 <4.14