| Year | Rank | Population | Answer | % Correct |
|---|---|---|---|---|
| 3. | 17,800,000 | New York | 99%
| |
| 7. | 18,300,000 | New York | 99%
| |
| 2000 | 1. | 34,400,000 | Tokyo | 97%
|
| 2010 | 1. | 36,800,00 | Tokyo | 97%
|
| 2020 | 1. | 37,300,000 | Tokyo | 97%
|
| 7. | 20,400,000 | Beijing | 95%
| |
| 7. | 15,600,000 | New Delhi | 95%
| |
| 2. | 21,900,000 | New Delhi | 95%
| |
| 2. | 30,200,000 | New Delhi | 95%
| |
| 3. | 20,300,000 | Shanghai | 94%
| |
| 3. | 27,000,000 | Shanghai | 94%
| |
| 6. | 16,100,000 | Mumbai | 86%
| |
| 4. | 18,400,000 | Mexico City | 82%
| |
| 4. | 20,100,000 | Mexico City | 82%
| |
| 5. | 21,700,000 | Mexico City | 82%
| |
| 5. | 17,000,000 | Sao Paulo | 81%
| |
| 5. | 19,600,000 | Sao Paulo | 81%
| |
| 4. | 22,000,000 | Sao Paulo | 81%
| |
| 2. | 18,600,000 | Osaka | 68%
| |
| 6. | 19,300,000 | Osaka | 68%
| |
| 6. | 21,000,000 | Dhaka | 56%
|