Spain
| 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 |
|---|---|---|---|---|---|---|
| 2023 | PR | List PR | 1.00 | 350 | 350 | Not applicable |
| 2019 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 2016 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 2015 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 2011 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 2008 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 2004 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 2000 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 1996 | PR | List PR | 1 | 350 | 350 | Not applicable |
| 1993 | PR | List PR | 1 | 350 | 350 | Not applicable |
