Year	Number of
2000	2
2001	2
2002	4
2003	0
2004	0
2005	2
2006	1
2007	1
2008	2
2009	4
2010	0
2011	2
2012	1
2013	2
2014	0
2015	1
2016	0
2017	2
2018	2
2019	1
2020	1