Mexico
| 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 |
|---|---|---|---|---|---|---|
| 2021 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 2018 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 2015 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 2012 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 2009 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 2006 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 2003 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 2000 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 1997 | Mixed | MMP | 2 | 500 | 500 | FPTP |
| 1994 | 500.00 | Parallel | 2 | 500 | 500 | FPTP |
| 1991 | Mixed | MMP | 2 | 500 | 500 | FPTP |
