Statistics by the workplace:
| Year of reporting | Count |
|---|---|
| 1966 | 1 |
| 1979 | 1 |
| 1980 | 4 |
| 1981 | 1 |
| 1982 | 1 |
| 1983 | 2 |
| 1984 | 2 |
| 1985 | 8 |
| 1986 | 8 |
| 1987 | 7 |
| 1988 | 10 |
| 1989 | 20 |
| 1990 | 62 |
| 1991 | 60 |
| 1992 | 86 |
| 1993 | 102 |
| 1994 | 537 |
| 1995 | 686 |
| 1996 | 657 |
| 1997 | 1143 |
| 1998 | 1473 |
| 1999 | 1681 |
| 2000 | 1789 |
| 2001 | 1669 |
| 2002 | 1674 |
| 2003 | 1490 |
| 2004 | 2065 |
| 2005 | 2310 |
| 2006 | 1546 |
| 2007 | 2489 |
| 2008 | 2163 |
| 2009 | 2983 |
| 2010 | 3914 |
| 2011 | 2695 |
| 2012 | 2831 |
| 2013 | 3138 |
| 2014 | 2940 |
| 2015 | 2451 |
| 2016 | 2818 |
| 2017 | 2621 |
| 2018 | 2313 |
| 2019 | 2121 |
| 2020 | 1810 |
| 2021 | 1799 |
| 2022 | 1448 |
| 2023 | 1372 |
| 2024 | 1601 |
| 2025 | 537 |