| Year | Rank | Population | Answer | % Correct |
|---|---|---|---|---|
| 2000 | 4. | 7.3m | London | 100%
|
| 2010 | 4. | 8m | London | 100%
|
| 2020 | 4. | 9.3m | London | 100%
|
| 2000 | 1. | 9.9m | Moscow | 100%
|
| 2010 | 2. | 11.4m | Moscow | 100%
|
| 2020 | 2. | 12.4m | Moscow | 100%
|
| 2000 | 2. | 9.8m | Paris | 100%
|
| 2010 | 3. | 10.4m | Paris | 100%
|
| 2020 | 3. | 11m | Paris | 100%
|
| 2000 | 3. | 9m | Istanbul | 95%
|
| 2010 | 1. | 12.3m | Istanbul | 95%
|
| 2020 | 1. | 15.3m | Istanbul | 95%
|
| 2000 | 5. | 5m | Madrid | 95%
|
| 2010 | 5. | 5.7m | Madrid | 95%
|
| 2020 | 5. | 6.5m | Madrid | 95%
|
| 2000 | 6. | 4.7m | St. Petersburg | 89%
|
| 2010 | 7. | 4.8m | St. Petersburg | 89%
|
| 2020 | 7. | 5.4m | St. Petersburg | 89%
|
| 2000 | 7. | 4.4m | Barcelona | 87%
|
| 2010 | 6. | 4.8m | Barcelona | 87%
|
| 2020 | 6. | 5.4m | Barcelona | 87%
|