Year	Number
2000	6
2001	1
2002	0
2003	0
2004	1
2005	0
2006	0
2007	1
2008	1
2009	2
2010	5
2011	2
2012	7
2013	6
2014	0
2015	8
2016	3
2017	5
2018	3
2019	5
2020	2