Union of the Centre (2008) Popular support Popular support

| _1996_general | _1999_European | _2001_general | _2004_European | _2006_general | _2008_general | _2009_European | _2013_general |
|---|---|---|---|---|---|---|---|
| 4.4 | 3.3 | 3.5 | 5.0 | 6.2 | 5.2 | 6.1 | 1.2 |
| 4.6 | 3.5 | 3.4 | 3.6 | 5.9 | 4.3 | 5.0 | 1.1 |
| 5.4 | 5.4 | 5.0 | 5.0 | 7.8 | 5.6 | 6.4 | 1.7 |
| 4.8 | 2.7 | 3.4 | 2.8 | 5.8 | 4.3 | 4.7 | 1.1 |
| 4.8 | 3.2 | 3.3 | 3.3 | 5.9 | 4.2 | 4.6 | 1.1 |
| 4.7 | 4.8 | 4.8 | 7.1 | 6.9 | 4.8 | 5.5 | 1.5 |
| 8.0 | 6.8 | 7.5 | 7.0 | 6.8 | 6.5 | 8.7 | 3.6 |
| 7.6 | 6.0 | 6.8 | 8.1 | 7.8 | 7.9 | 9.1 | 2.0 |
| 9.0 | 9.4 | 9.5 | 9.6 | 7.7 | 8.2 | 9.3 | 4.1 |
| 8.1 | 7.9 | 14.4 | 14.0 | 10.0 | 9.4 | 11.9 | 2.8 |
| 5.8 | 4.8 | 5.6 | 5.9 | 6.8 | 5.6 | 6.5 | 1.8 |