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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1970 | 9 october | Khmer Republic | Cheng Heng | Lon Nol (II) |
| 1971 | 6 may | Sisowath Sirik Matak | ||
| 1972 | 10 march | Lon nol | ||
| 1972 | 18 march | Son Ngoc Thanh | ||
| 1972 | 21 march | Lon Nol (III) | ||
| 1972 | 15 october | Hang Thun Hak | ||
| 1973 | 6 may | In Tam | ||
| 1973 | 26 december | Long Boreth | ||
| 1975 | 12 april | gen. Sak Suthsakan |
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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1975 | 17 april | Democratic Republic | Prince Norodom II Sihanouk (III) | Samdech Penn Nouth (VII) |
| 1976 | 4 april | Khieu Samphan | ||
| 1976 | 11 april | Khieu Samphan | ||
| 1976 | 13 may | Pol Pot |
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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1979 | 7 january | Popular Republic | Heng Samrin | - |
| 1981 | 27 june | Pen Sovan | ||
| 1981 | 5 december | Chan Sy | ||
| 1985 | 15 january | Hun Sen (I) |
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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1992 | 6 april | Chea Sim |
| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1993 | 14 june | Prince Norodom II Sihanouk (IV) |