Year	Number
1996	4
1998	4
2000	4
2002	5
2003	6
2004	8
2005	9
2006	9
2007	8
2008	9
2009	9
2010	9
2011	9
2012	10
2013	10
2014	10
2015	10
2016	10
2017	10
2018	10
2019	10
2020	10
2021	10
2022	10