| 2000 | 2005 | 2010 | 2011 | 2012 | |
|---|---|---|---|---|---|
| Flevoland | 20.0 | 19.7 | 25.8 | 26.1 | 25.8 |
| Groningen | 26.8 | 27.8 | 25.4 | 25.7 | 25.7 |
| Utrecht | 25.3 | 26.6 | 24.0 | 24.5 | 24.3 |
| Overijssel | 24.8 | 24.8 | 24.2 | 24.4 | 24.3 |
| Gelderland | 21.0 | 22.3 | 23.5 | 23.7 | 23.6 |
| Friesland | 22.3 | 22.5 | 23.2 | 23.6 | 23.6 |
| Zuid-Holland | 21.6 | 22.4 | 22.7 | 23.1 | 23.0 |
| Noord-Brabant | 22.0 | 22.3 | 22.5 | 22.7 | 22.6 |
| Drenthe | 17.0 | 16.9 | 21.8 | 22.3 | 22.3 |
| Noord-Holland | 21.2 | 20.5 | 22.0 | 22.3 | 22.2 |
| Zeeland | 19.6 | 19.7 | 20.9 | 21.1 | 21.0 |
| Limburg | 19.7 | 19.9 | 20.6 | 20.5 | 20.5 |