| Letter | Year | Country | % Correct |
|---|---|---|---|
| S | 2011 | South Sudan | 96%
|
| Y | 1990 | Yemen | 95%
|
| Q | 1971 | Qatar | 94%
|
| Z | 1980 | Zimbabwe | 94%
|
| O | 1970 | Oman | 93%
|
| K | 2008 | Kosovo | 87%
|
| U | 1991 | Uzbekistan | 85%
|
| T | 1991 | Turkmenistan | 82%
|
| V | 1980 | Vanuatu | 82%
|
| A | 1991 | Azerbaijan | 80%
|
| J | 1962 | Jamaica | 77%
|
| R | 1991 | Russia | 76%
|
| B | 1991 | Belarus | 75%
|
| E | 2002 | East Timor | 75%
|
| H | 1922 | Honduras | 75%
|
| G | 1991 | Georgia | 73%
|
| L | 1990 | Latvia | 70%
|
| M | 2006 | Montenegro | 70%
|
| P | 1994 | Palau | 70%
|
| N | 1991 | North Macedonia | 68%
|
| D | 1978 | Dominica | 57%
|
| F | 1990 | Federated States of Micronesia | 57%
|
| C | 1993 | Czech Republic | 55%
|
| I | 1960 | Ivory Coast | 48%
|