| 2005 | 2010 | 2011 | 2012 | |
|---|---|---|---|---|
| Mazowieckie | 1.5 | 1.5 | 1.5 | 1.5 |
| Malopolskie | 1.2 | 1.3 | 1.3 | 1.3 |
| Dolnoslaskie | 1.1 | 1.2 | 1.2 | 1.2 |
| Wielkopolskie | 1.0 | 1.0 | 1.0 | 1.0 |
| Lódzkie | 0.9 | 1.1 | 1.0 | 1.0 |
| Pomorskie | 0.9 | 1.0 | 1.0 | 1.0 |
| Lubelskie | 0.9 | 1.0 | 1.0 | 1.0 |
| Podlaskie | 0.9 | 0.9 | 0.9 | 0.9 |
| Swietokrzyskie | 1.0 | 0.8 | 0.8 | 0.8 |
| Zachodniopomorskie | 1.1 | 0.9 | 0.8 | 0.8 |
| Opolskie | 0.7 | 0.8 | 0.8 | 0.8 |
| Kujawsko-Pomorskie | 0.8 | 0.8 | 0.8 | 0.8 |
| Slaskie | 0.8 | 0.8 | 0.8 | 0.8 |
| Podkarpackie | 0.7 | 0.7 | 0.7 | 0.7 |
| Warminsko-Mazurskie | 0.8 | 0.7 | 0.7 | 0.7 |
| Lubuskie | 0.6 | 0.5 | 0.5 | 0.4 |