Year	Number
2000	3
2001	3
2002	3
2003	7
2004	7
2005	7
2006	8
2007	8
2008	8
2009	8
2010	7
2011	10
2012	9
2013	2
2014	1
2015	2
2016	2
2017	5
2018	2
2019	5
2020	4