Year	Number
1996	5
1998	5
2000	6
2002	7
2003	7
2004	8
2005	9
2006	9
2007	9
2008	9
2009	9
2010	10
2011	10
2012	10
2013	11
2014	7
2015	7
2016	7
2017	7
2018	8
2019	8
2020	8
2021	8
2022	8