Just did some amateur calculations using the populations per country with the most up-to-date numbers I could get with Google's search results. I only used the numbers from the post on the first page with PS4 sales per country.
Percentage of population in PS4 sales:
1. UK (10.30%)
1 in 9.71
6.8m consoles / 66.04m people
2. United States (9.17%)
1 in 10.91
30.0m consoles / 327.2m people
3. France (8.96%)
1 in 11.17
6m consoles / 66.99m people
4. Germany (8.70%)
1 in 11.50
7.2m consoles / 82.79m people
5. Spain (6.64%)
1 in 15.07
3.1m consoles / 46.72m people
6. Japan (6.55%)
1 in 15.28
8.3m consoles / 126.8m people
Edit: I'm curious how much these numbers would change if XB1 and Switch were to be included.