Year	Number
1996	2
1998	2
2000	2
2002	2
2003	3
2004	5
2005	6
2006	7
2007	7
2008	7
2009	7
2010	7
2011	7
2012	7
2013	8
2014	8
2015	8
2016	8
2017	9
2018	10
2019	10
2020	9
2021	9
2022	10