Year	Number of
2000	1
2001	2
2002	2
2003	3
2004	4
2005	3
2006	4
2007	5
2008	2
2009	1
2010	2
2011	1
2012	2
2013	3
2014	3
2015	2
2016	3
2017	2
2018	3
2019	2
2020	3