Year	Number
1996	2
1998	2
2000	2
2002	3
2003	3
2004	5
2005	7
2006	7
2007	7
2008	7
2009	9
2010	9
2011	9
2012	10
2013	10
2014	10
2015	10
2016	10
2017	10
2018	10
2019	10
2020	9
2021	9
2022	9