Year	Number
2000	5
2001	1
2002	5
2003	1
2004	4
2005	7
2006	5
2007	2
2008	1
2009	3
2010	8
2011	7
2012	3
2013	12
2014	3
2015	4
2016	3
2017	1
2018	6
2019	0
2020	2