Year of reporting	Count
1998	1
1999	2
2000	2
2002	2
2003	2
2004	2
2005	2
2006	1
2007	2
2008	2
2009	3
2010	3
2011	2
2012	2
2013	4
2014	3
2016	1

Statistics by the author: Šavelová Jana