| Accession | Country | % Correct |
|---|---|---|
| 8th August 1967(Founders) | Indonesia | 100%
|
| 23rd July 1997 | Laos | 94%
|
| Malaysia | 94%
| |
| 28th July 1995 | Vietnam | 94%
|
| 7th January 1984 | Brunei | 88%
|
| 30th April 1999 | Cambodia | 88%
|
| Philippines | 88%
| |
| Singapore | 88%
| |
| Thailand | 88%
| |
| Myanmar | 76%
|