| Letter | Year | Country | % Correct |
|---|---|---|---|
| Y | 1990 | Yemen | 95%
|
| Z | 1964 | Zambia | 92%
|
| Q | 1971 | Qatar | 91%
|
| E | 3150 BC | Egypt | 88%
|
| F | 481 | France | 88%
|
| O | 751 | Oman | 86%
|
| C | 2070 BC | China | 85%
|
| I | 3200 BC | Iran | 84%
|
| J | 330 BC | Jordan | 84%
|
| H | 895 | Hungary | 82%
|
| R | 1480 | Russia | 81%
|
| V | 544 | Vietnam | 81%
|
| G | 338 BC | Greece | 80%
|
| D | 714 | Denmark | 78%
|
| A | 202 BC | Algeria | 58%
|
| T | 1238 | Thailand | 53%
|
| U | 1649 | Ukraine | 51%
|
| P | 711 | Pakistan | 50%
|
| K | 1465 | Kazakhstan | 46%
|
| M | 788 | Morocco | 46%
|
| L | 1253 | Lithuania | 42%
|
| S | 2333 BC | South Korea | 38%
|
| B | 590 | Bangladesh | 34%
|
| N | 2333 BC | North Korea | 34%
|