| 2000 | 2005 | 2010 | |
|---|---|---|---|
| Nordrhein-Westfalen | 398 | 444 | 404 |
| Bayern | 407 | 377 | 369 |
| Baden-Württemberg | 317 | 290 | 283 |
| Niedersachsen | 213 | 204 | 198 |
| Hessen | 175 | 169 | 181 |
| Rheinland-Pfalz | 118 | 97 | 98 |
| Berlin | 76 | 71 | 79 |
| Schleswig-Holstein | 94 | 95 | 72 |
| Brandenburg | 54 | 47 | 52 |
| Sachsen-Anhalt | 56 | 50 | 50 |
| Thüringen | 53 | 46 | 42 |
| Mecklenburg-Vorpommern | 35 | 34 | 39 |
| Hamburg | 35 | 43 | 37 |
| Saarland | 27 | 26 | 24 |
| Bremen | 16 | 14 | 14 |