São Tomé and Príncipe
| Year | Electoral system family | Electoral system for national legislature | Number of tiers | Legislative size (directly elected) | Legislative size (voting members) | Electoral system for the president |
|---|---|---|---|---|---|---|
| 2022 | PR | List PR | 1 | 55 | 55 | TRS |
| 2018 | PR | List PR | 1 | 55 | 55 | TRS |
| 2014 | PR | List PR | 1 | 55 | 55 | TRS |
| 2010 | PR | List PR | 1 | 55 | 55 | TRS |
| 2006 | PR | List PR | 1 | 55 | 55 | TRS |
| 2002 | PR | List PR | 1 | 55 | 55 | TRS |
| 1998 | PR | List PR | 1 | 55 | 55 | TRS |
| 1994 | PR | List PR | 1 | 55 | 55 | TRS |
| 1991 | PR | List PR | 1 | 55 | 55 | TRS |
