| Jahr | öffentliche Träger | private Träger | freigemeinnützige Träger |
|---|---|---|---|
| 1999 | 72 | 167 | 407 |
| 2001 | 71 | 188 | 416 |
| 2003 | 66 | 216 | 432 |
| 2005 | 62 | 246 | 449 |
| 2007 | 54 | 275 | 470 |
| 2009 | 55 | 302 | 488 |
| 2011 | 53 | 324 | 498 |
| 2013 | 53 | 342 | 508 |
| 2015 | 57 | 364 | 509 |
| 2017 | 56 | 378 | 518 |
| 2019 | 55 | 393 | 522 |
| 2021 | 56 | 405 | 524 |
| 2023 | 56 | 408 | 525 |