Year	Number of
2000	3
2001	2
2002	3
2003	1
2004	2
2005	1
2006	1
2007	7
2008	2
2009	2
2010	4
2011	4
2012	2
2013	3
2014	3
2015	3
2016	5
2017	1
2018	3
2019	2
2020	2