Year	Number
2000	13
2001	11
2002	10
2003	10
2004	10
2005	10
2006	9
2007	9
2008	10
2009	10
2010	10
2011	9
2012	9
2013	7
2014	7
2015	9
2016	9
2017	10
2018	10
2019	10
2020	10