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