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