Year of reporting	Count
1997	1
1998	1
1999	2
2001	1
2002	2
2003	2
2004	4
2005	2
2006	1
2007	1
2008	3
2009	1
2010	5
2011	3
2012	5
2013	1
2014	2
2016	2
2017	4
2018	2
2019	2
2020	3
2021	2
2023	3

Statistics by the author: Zemaníková Nadežda