| when | GDP PPP Per Capita | Country | % Correct |
|---|---|---|---|
| Before WWI | $10,400 | United States | 100%
|
| Before WWI | $9,310 | United Kingdom | 97%
|
| Before WWI | $9,170 | Australia | 79%
|
| Before WWI | $7,340 | Canada | 79%
|
| After WWI | $7,330 | Canada | 79%
|
| Before WWI | $7,060 | Netherlands | 79%
|
| Before WWI | $8,690 | Switzerland | 76%
|
| Before WWI | $7,500 | Denmark | 74%
|
| Before WWI | $7,160 | Belgium | 71%
|
| After WWI | $6,850 | Luxembourg | 68%
|
| Before WWI | $9,470 | New Zealand | 68%
|
| Before WWI | $6,880 | Monaco | 59%
|
| Before WWII | $11,900 | Brunei | 3%
|
| After WWII | $10,700 | Bahamas | 0%
|