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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1972 | 22 may | Republic | William Gopallawa | Sirimavo Bandaranaike (II) |
| 1977 | 23 july | Junius Richard Jayawardene | ||
| 1978 | 4 february | Junius Richard Jayawardene | Ranasinghe Premadasa | |
| 1989 | 2 january | Ranasinghe Premadasa | ||
| 1989 | 3 march | Dingiri Banda Wijetunge | ||
| 1993 | 1 may | Dingiri Banda Wijetunge | Ranil Wickremesinghe (I) | |
| 1994 | 19 august | Chandrika Bandaranaike Kumaratunga | ||
| 1994 | 12 november | Chandrika Bandaranaike Kumaratunga | Sirimavo Bandaranaike (III) | |
| 2000 | 10 august | Ratnasiri Wickremanayake | ||
| 2001 | 9 december | Ranil Wickremesinghe (II) | ||
| 2004 | 2 april | Mahinda Rajapakse | ||
| 2005 | 17 november | Mahinda Rajapakse | Ranil Wickremesinghe (III) | |
| 2010 | 21 april | D.M. Jayaratne | ||
| 2015 | 9 january | Maithripala Sirisena | Ranil Wickremesinghe (IV) | |
| 2019 | 16 november | Gotabaya Rajapakse | Mahinda Rajapakse | |
| 2022 | 12 may | Ranil Wickremesinghe (V) | ||
| 2022 | 13 july | Ranil Wickremesinghe | ||
| 2022 | 22 july | Dinesh Gunawardene |