Statistics by the author: Michal Jiří
| Year of reporting | Count |
|---|---|
| 1991 | 2 |
| 1992 | 4 |
| 1993 | 3 |
| 1994 | 6 |
| 1995 | 5 |
| 1996 | 3 |
| 1997 | 7 |
| 1998 | 9 |
| 1999 | 4 |
| 2000 | 4 |
| 2001 | 5 |
| 2002 | 5 |
| 2003 | 8 |
| 2004 | 4 |
| 2005 | 14 |
| 2006 | 19 |
| 2007 | 15 |
| 2008 | 5 |
| 2009 | 15 |
| 2010 | 14 |
| 2011 | 10 |
| 2012 | 6 |
| 2013 | 13 |
| 2014 | 11 |
| 2015 | 10 |
| 2016 | 5 |
| 2017 | 4 |
| 2018 | 1 |
| 2019 | 8 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 4 |
| 2023 | 4 |