Stand 31.12.0221
| Jahr | Anzahl |
| 2021 | 399 |
| 2020 | 407 |
| 2019 | 418 |
| 2018 | 423 |
| 2017 | 432 |
| 2016 | 432 |
| 2015 | 439 |
| 2014 | 444 |
| 2013 | 452 |
| 2012 | 458 |
| 2011 | 469 |
| 2010 | 475 |
| 2009 | 482 |
| 2008 | 481 |
| 2007 | 488 |
| 2006 | 491 |
| 2005 | 498 |
| 2004 | 507 |
| 2003 | 516 |
| 2002 | 513 |
| 2001 | 518 |
| 2000 | 524 |
| 1999 | 530 |
| 1998 | 529 |
| 1997 | 530 |
