| Joined | Status | Country | % Correct |
|---|---|---|---|
| 1997 | Member | Laos | 94%
|
| Founder | Member | Malaysia | 94%
|
| 1995 | Member | Vietnam | 94%
|
| 1999 | Member | Cambodia | 92%
|
| Founder | Member | Thailand | 92%
|
| Founder | Member | Indonesia | 90%
|
| Founder | Member | Philippines | 90%
|
| Founder | Member | Singapore | 90%
|
| 1984 | Member | Brunei | 88%
|
| 1997 | Member | Myanmar | 88%
|
| Maybe? | Candidate/observer state | East Timor | 86%
|
| N/A | Observer state | Papua New Guinea | 65%
|