| 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| in procenten | ||||||
| Groningen | 2 | 2 | 2 | 2 | 2 | 2 |
| Friesland | 9 | 8 | 9 | 8 | 8 | 7 |
| Drenthe | 9 | 10 | 10 | 10 | 10 | 10 |
| Overijssel | 10 | 9 | 10 | 9 | 10 | 9 |
| Flevoland | 2 | 2 | 2 | 2 | 2 | 2 |
| Gelderland | 18 | 18 | 17 | 17 | 16 | 18 |
| Utrecht | 3 | 3 | 3 | 3 | 2 | 3 |
| Noord-Holland | 10 | 10 | 10 | 11 | 12 | 11 |
| Zuid-Holland | 7 | 6 | 6 | 6 | 6 | 5 |
| Zeeland | 12 | 10 | 9 | 9 | 8 | 9 |
| Noord-Brabant | 10 | 10 | 10 | 11 | 11 | 11 |
| Limburg | 11 | 13 | 13 | 12 | 13 | 13 |
| Totaal | 100% | 100% | 100% | 100% | 100% | 100% |