| 2000 | 2005 | 2010 | 2011 | 2012 | |
|---|---|---|---|---|---|
| Zuid-Holland | 20.1 | 24.6 | 22.3 | 22.5 | 19.5 |
| Noord-Holland | 18.1 | 13.4 | 17.1 | 17.2 | 14.9 |
| Noord-Brabant | 13.7 | 14.0 | 13.4 | 13.5 | 11.7 |
| Gelderland | 8.9 | 9.3 | 11.1 | 11.2 | 9.7 |
| Utrecht | 11.8 | 11.5 | 9.6 | 9.4 | 8.1 |
| Groningen | 7.3 | 7.4 | 6.7 | 6.6 | 5.7 |
| Overijssel | 7.5 | 7.7 | 6.4 | 6.4 | 5.5 |
| Limburg | 5.4 | 5.2 | 5.8 | 5.8 | 5.0 |
| Friesland | 3.1 | 3.0 | 3.2 | 3.2 | 2.8 |
| Flevoland | 0.2 | 0.4 | 1.8 | 1.8 | 1.5 |
| Drenthe | 0.4 | 0.4 | 1.6 | 1.6 | 1.4 |
| Zeeland | 0.7 | 0.7 | 1.1 | 1.1 | 0.9 |