Year	Number
1996	4
1998	4
2000	5
2002	7
2003	7
2004	7
2005	7
2006	8
2007	8
2008	8
2009	9
2010	10
2011	10
2012	10
2013	10
2014	10
2015	10
2016	9
2017	9
2018	9
2019	9
2020	8
2021	8
2022	8