Year	Number of
2000	11
2001	9
2002	7
2003	5
2004	3
2005	4
2006	6
2007	5
2008	5
2009	5
2010	4
2011	4
2012	4
2013	5
2014	6
2015	6
2016	5
2017	4
2018	4
2019	3
2020	3