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