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