| 2000 | 2005 | 2010 | 2011 | |
|---|---|---|---|---|
| Nordrhein-Westfalen | 11 906 | 14 741 | 11 982 | 11 202 |
| Bayern | 12 152 | 10 878 | 7 579 | 6 983 |
| Baden-Württemberg | 9 182 | 8 419 | 6 245 | 5 922 |
| Niedersachsen | 8 447 | 8 345 | 5 218 | 5 085 |
| Hessen | 6 468 | 5 280 | 3 863 | 3 370 |
| Berlin | 4 612 | 3 576 | 2 730 | 2 487 |
| Rheinland-Pfalz | 4 284 | 3 487 | 2 565 | 2 469 |
| Schleswig-Holstein | 2 854 | 3 098 | 2 202 | 2 143 |
| Sachsen-Anhalt | 4 704 | 3 845 | 1 844 | 1 738 |
| Brandenburg | 3 348 | 3 397 | 1 629 | 1 411 |
| Mecklenburg-Vorpommern | 3 123 | 2 548 | 1 434 | 1 345 |
| Thüringen | 4 543 | 2 308 | 1 266 | 1 157 |
| Hamburg | 1 884 | 1 771 | 1 224 | 1 020 |
| Saarland | 1 108 | 939 | 566 | 487 |
| Bremen | 657 | 690 | 370 | 482 |