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