Year	Number of
2000	6
2001	5
2002	4
2003	3
2004	3
2005	3
2006	3
2007	4
2008	5
2009	5
2010	5
2011	6
2012	7
2013	7
2014	8
2015	8
2016	8
2017	8
2018	8
2019	8
2020	8