Datasets:
| Characteristic,Number of employees | |
| 2019,26276 | |
| 2018,25538 | |
| 2017,24583 | |
| 2016,23619 | |
| 2015*,22848 | |
| 2014,22754 | |
| 2013,21874 | |
| 2012,21238 | |
| 2011,20744 | |
| 2010,20114 | |
| 2009*,19546 | |
| 2008,19088 | |
| 2007,18356 | |
| 2006,17667 | |
| 2005,16734 | |
| 2004,15813 | |
| 2003,14950 | |
| 2002*,14849 | |
| 2001,15978 | |
| 2000,15180 | |