Year	Number of
2000	4
2001	2
2002	3
2003	3
2004	3
2005	2
2006	2
2007	2
2008	1
2009	2
2010	1
2011	2
2012	2
2013	2
2014	2
2015	2
2016	1
2017	3
2018	1
2019	2
2020	1