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