German Democratic Republic 1968
Cuba 1976
Cambodia 1986
Mongolia 1986
Guinea-Bissau 1988
Laos 1988
Cambodia 1994
Vietnam 1994
Yugoslavia 1995
Benin 1999
Tadjikistan 2000
Myanmar 2001
Equatorial Guinea 2005
| German Democratic Republic 1968 | Cuba 1976 | Cambodia 1986 |
| Mongolia 1986 | Guinea-Bissau 1988 | Laos 1988 |
| Cambodia 1994 | Vietnam 1994 | Yugoslavia 1995 |
| Benin 1999 | Tadjikistan 2000 | Myanmar 2001 |
| Equatorial Guinea 2005 |